diff --git a/packages/simon/config/config.js b/packages/simon/config/config.js
index 28d6452390d..829a9dd1e56 100644
--- a/packages/simon/config/config.js
+++ b/packages/simon/config/config.js
@@ -41,7 +41,12 @@ export default {
     yoke: "backBase",
     sleeve: "sleeveBase"
   },
-  parts: ["collarStand", "collar"],
+  parts: [
+    "collarStand",
+    "collar",
+    "sleevePlacketUnderlap",
+    "sleevePlacketOverlap"
+  ],
   hide: ["base", "frontBase", "front", "backBase", "sleeveBase"],
   options: {
     // Constants
diff --git a/packages/simon/index.html b/packages/simon/index.html
index 855031cdca1..dfe6cf102a3 100644
--- a/packages/simon/index.html
+++ b/packages/simon/index.html
@@ -113,7 +113,7 @@ let settings1 = { ...settings };
       pattern1.settings.options.buttonholePlacketType = "seperate";
       //pattern1.settings.options.splitYoke = "yes";
       pattern1.settings.sa = 10;
-      pattern1.settings.only = "collar";
+      pattern1.settings.only = "sleevePlacketOverlap";
       pattern1.draft();
       console.log(pattern1);
       document.getElementById("svg1").innerHTML = pattern1.render();
diff --git a/packages/simon/package.json b/packages/simon/package.json
index daafa8dc650..282199982a1 100644
--- a/packages/simon/package.json
+++ b/packages/simon/package.json
@@ -27,7 +27,7 @@
     "major": "npm version major -m ':bookmark: v%s' && npm run build",
     "test": "echo \"Error: no test specified\" && exit 1",
     "clean": "rimraf dist",
-    "pretty": "npx prettier --write \"src/*.js\"",
+    "pretty": "npx prettier --write \"src/*.js\" \"config/*.js\"",
     "lint": "eslint --fix \"src/*.js\"",
     "watch": "nodemon -w src --exec npm run browserbuild",
     "browserbuild": "rollup -c rollup.js -o dist/browser.js -f iife -m true -n freesewing_patterns_simon --footer 'freesewing.patterns.simon = freesewing_patterns_simon;'",
diff --git a/packages/simon/src/back.js b/packages/simon/src/back.js
index 2f7acec0736..12f79adcf8d 100644
--- a/packages/simon/src/back.js
+++ b/packages/simon/src/back.js
@@ -6,27 +6,52 @@ export default part => {
 
   // Populare store with data we need
   calculateReduction(part);
-  store.set("backArmholeLength", new Path()
+  store.set(
+    "backArmholeLength",
+    new Path()
       .move(points.armhole)
       .curve(points.armholeCp2, points.armholeHollowCp1, points.armholeHollow)
-      .curve(points.armholeHollowCp2, points.armholePitchCp1, points.armholePitch)
+      .curve(
+        points.armholeHollowCp2,
+        points.armholePitchCp1,
+        points.armholePitch
+      )
       .curve(points.armholePitchCp2, points.shoulderCp1, points.shoulder)
-      .length());
+      .length()
+  );
 
   // Waist shaping
-  let reduce = store.get('waistReduction');
-  if(reduce/4 > options.minimalDartShaping) {
+  let reduce = store.get("waistReduction");
+  if (reduce / 4 > options.minimalDartShaping) {
     // Add darts in the back
-    points.waist = points.waist.shift(180, reduce/8);
+    points.waist = points.waist.shift(180, reduce / 8);
     points.dartCenter = points.cbWaist.shiftFractionTowards(points.waist, 0.6);
-    points.dartTop = points.dartCenter.shift(90, points.armhole.dy(points.waist) * 0.75);
-    points.dartBottom = points.dartCenter.shift(-90, measurements.naturalWaistToHip * 0.75);
-    points.dartCenterIn = points.dartCenter.shift(180, reduce/8);
-    points.dartCenterOut = points.dartCenter.shift(0, reduce/8);
-    points.dartCenterInCp1 = points.dartCenterIn.shift(90, points.dartTop.dy(points.dartCenter) * 0.2);
-    points.dartCenterInCp2 = points.dartCenterIn.shift(90, points.dartBottom.dy(points.dartCenter) * 0.2);
-    points.dartCenterOutCp1 = points.dartCenterOut.shift(90, points.dartBottom.dy(points.dartCenter) * 0.2);
-    points.dartCenterOutCp2 = points.dartCenterOut.shift(90, points.dartTop.dy(points.dartCenter) * 0.2);
+    points.dartTop = points.dartCenter.shift(
+      90,
+      points.armhole.dy(points.waist) * 0.75
+    );
+    points.dartBottom = points.dartCenter.shift(
+      -90,
+      measurements.naturalWaistToHip * 0.75
+    );
+    points.dartCenterIn = points.dartCenter.shift(180, reduce / 8);
+    points.dartCenterOut = points.dartCenter.shift(0, reduce / 8);
+    points.dartCenterInCp1 = points.dartCenterIn.shift(
+      90,
+      points.dartTop.dy(points.dartCenter) * 0.2
+    );
+    points.dartCenterInCp2 = points.dartCenterIn.shift(
+      90,
+      points.dartBottom.dy(points.dartCenter) * 0.2
+    );
+    points.dartCenterOutCp1 = points.dartCenterOut.shift(
+      90,
+      points.dartBottom.dy(points.dartCenter) * 0.2
+    );
+    points.dartCenterOutCp2 = points.dartCenterOut.shift(
+      90,
+      points.dartTop.dy(points.dartCenter) * 0.2
+    );
     paths.dart = new Path()
       .move(points.dartTop)
       ._curve(points.dartCenterInCp1, points.dartCenterIn)
@@ -34,25 +59,35 @@ export default part => {
       ._curve(points.dartCenterOutCp1, points.dartCenterOut)
       .curve_(points.dartCenterOutCp2, points.dartTop)
       .close()
-      .attr('class', 'fabric');
+      .attr("class", "fabric");
   } else {
     // No darts in the back
-    points.waist = points.waist.shift(180, reduce/4);
+    points.waist = points.waist.shift(180, reduce / 4);
   }
-  points.waistCp1 = points.waist.shift(-90, measurements.naturalWaistToHip * 0.5);
-  points.waistCp2 = points.waist.shift(90, points.armhole.dy(points.waist)/2);
-  points.hipsCp2 = points.hips.shift(90, points.waist.dy(points.hips)/4);
+  points.waistCp1 = points.waist.shift(
+    -90,
+    measurements.naturalWaistToHip * 0.5
+  );
+  points.waistCp2 = points.waist.shift(90, points.armhole.dy(points.waist) / 2);
+  points.hipsCp2 = points.hips.shift(90, points.waist.dy(points.hips) / 4);
 
   // Yoke dart
   paths.armhole = new Path()
     .move(points.armhole)
     .curve(points.armholeCp2, points.armholeHollowCp1, points.armholeHollow)
-    .curve(points.armholeHollowCp2, points.armholePitchCp1, points.armholePitch);
+    .curve(
+      points.armholeHollowCp2,
+      points.armholePitchCp1,
+      points.armholePitch
+    );
   paths.armhole.render = false;
-  if(options.yokeDart > 0) {
-    points.tmp1 = points.armholePitch.shift(-90, points.armholePitch.dy(points.armhole) * options.yokeDart);
-    points.tmp2 = points.tmp1.shift(180,50);
-    points.tmp3 = points.tmp1.shift(0,50);
+  if (options.yokeDart > 0) {
+    points.tmp1 = points.armholePitch.shift(
+      -90,
+      points.armholePitch.dy(points.armhole) * options.yokeDart
+    );
+    points.tmp2 = points.tmp1.shift(180, 50);
+    points.tmp3 = points.tmp1.shift(0, 50);
     points.yokeDartEdge = utils.lineIntersectsCurve(
       points.tmp2,
       points.tmp3,
@@ -61,14 +96,21 @@ export default part => {
       points.armholeHollowCp2,
       points.armholeHollow
     );
-    points.yokeDartTip = points.armholePitch.shift(180, points.armholePitch.x * 0.4);
-    points.yokeDartTipCp1 = points.armholePitch.shiftFractionTowards(points.yokeDartTip, 0.4);
+    points.yokeDartTip = points.armholePitch.shift(
+      180,
+      points.armholePitch.x * 0.4
+    );
+    points.yokeDartTipCp1 = points.armholePitch.shiftFractionTowards(
+      points.yokeDartTip,
+      0.4
+    );
     paths.armhole = paths.armhole.split(points.yokeDartEdge)[0];
-    paths.armhole._curve(points.yokeDartTipCp1, points.yokeDartTip)
+    paths.armhole._curve(points.yokeDartTipCp1, points.yokeDartTip);
     // Adapt armhole length to accomodate dart
     store.set(
       "backArmholeLength",
-      store.get("backArmholeLength") - points.yokeDartEdge.dist(points.armholePitch)
+      store.get("backArmholeLength") -
+        points.yokeDartEdge.dist(points.armholePitch)
     );
   }
 
@@ -76,10 +118,13 @@ export default part => {
   points.cbYoke = new Point(0, points.armholePitch.y);
 
   // Draft hem
-  switch(options.hemStyle) {
+  switch (options.hemStyle) {
     case "baseball":
       points.bballStart = points.cbHem.shiftFractionTowards(points.hem, 0.5);
-      points.bballEnd = points.hem.shiftFractionTowards(points.hips, options.hemCurve);
+      points.bballEnd = points.hem.shiftFractionTowards(
+        points.hips,
+        options.hemCurve
+      );
       points.bballCp1 = points.bballStart.shiftFractionTowards(points.hem, 0.5);
       points.bballCp2 = new Point(points.bballCp1.x, points.bballEnd.y);
       paths.saBase = new Path()
@@ -100,7 +145,7 @@ export default part => {
         to: points.cbHem,
         via: points.hem,
         radius: points.hips.dist(points.hem) * options.hemCurve,
-        prefix: "slash",
+        prefix: "slash"
       });
       paths.saBase = new Path()
         .move(points.hips)
@@ -127,7 +172,10 @@ export default part => {
   // Paths
   paths.saBase.render = false;
   paths.hemBase.render = false;
-  paths.seam = paths.hemBase.join(paths.saBase).close().attr('class', 'fabric');
+  paths.seam = paths.hemBase
+    .join(paths.saBase)
+    .close()
+    .attr("class", "fabric");
 
   // Complete pattern?
   if (complete) {
@@ -137,14 +185,14 @@ export default part => {
       to: points.cbHem,
       grainline: true
     });
-    points.title = new Point(points.armhole.x/4, points.armhole.y);
+    points.title = new Point(points.armhole.x / 4, points.armhole.y);
     macro("title", { at: points.title, nr: 3, title: "back" });
     points.logo = points.title.shift(-90, 70);
     snippets.logo = new Snippet("logo", points.logo);
 
-    if(sa) {
-      paths.sa = paths.saBase.offset(sa).attr('class', 'fabric sa');
-      paths.hemSa = paths.hemBase.offset(sa*3).attr('class', 'fabric sa');
+    if (sa) {
+      paths.sa = paths.saBase.offset(sa).attr("class", "fabric sa");
+      paths.hemSa = paths.hemBase.offset(sa * 3).attr("class", "fabric sa");
       paths.saConnect = new Path()
         .move(points.cbHem)
         .line(paths.hemSa.start())
@@ -152,7 +200,7 @@ export default part => {
         .line(paths.sa.start())
         .move(paths.sa.end())
         .line(points.cbYoke)
-        .attr('class', 'fabric sa');
+        .attr("class", "fabric sa");
     }
   }
 
diff --git a/packages/simon/src/index.js b/packages/simon/src/index.js
index 06275c34a5b..a540af63003 100644
--- a/packages/simon/src/index.js
+++ b/packages/simon/src/index.js
@@ -15,6 +15,8 @@ import draftYoke from "./yoke";
 import draftSleeve from "./sleeve";
 import draftCollarStand from "./collarstand";
 import draftCollar from "./collar";
+import draftSleevePlacketUnderlap from "./sleeveplacket-underlap";
+import draftSleevePlacketOverlap from "./sleeveplacket-overlap";
 
 // Constructor
 const Simon = function(settings) {
@@ -55,5 +57,7 @@ Simon.prototype.draftYoke = draftYoke;
 Simon.prototype.draftSleeve = draftSleeve;
 Simon.prototype.draftCollarStand = draftCollarStand;
 Simon.prototype.draftCollar = draftCollar;
+Simon.prototype.draftSleevePlacketUnderlap = draftSleevePlacketUnderlap;
+Simon.prototype.draftSleevePlacketOverlap = draftSleevePlacketOverlap;
 
 export default Simon;
diff --git a/packages/simon/src/sleeveplacket-overlap.js b/packages/simon/src/sleeveplacket-overlap.js
new file mode 100644
index 00000000000..be5ec198aa9
--- /dev/null
+++ b/packages/simon/src/sleeveplacket-overlap.js
@@ -0,0 +1,100 @@
+export default part => {
+  // prettier-ignore
+  let {store, measurements, utils, sa, Point, points, Path, paths, Snippet, snippets, complete, paperless, macro, options} = part.shorthand();
+
+  let width = options.sleevePlacketWidth;
+  let length = measurements.shoulderToWrist * options.sleevePlacketLength;
+
+  points.midLeft = new Point(0, 0);
+  points.midLen = points.midLeft.shift(0, length);
+  points.midRight = points.midLeft.shift(0, length + width * 1.25);
+  points.fold1Left = points.midLeft.shift(90, width / 2);
+  points.fold2Left = points.midLeft.shift(-90, width / 2);
+  points.boxTopRight = points.midRight.shift(90, width / 2);
+  points.boxBottomRight = points.midRight.shift(-90, width / 2);
+  points.boxTopLeft = points.midLen.shift(90, width / 2);
+  points.boxBottomLeft = points.midLen.shift(-90, width / 2);
+  points.boxTip = points.midLen.shift(0, width * 1.5);
+  points.fold1Right = points.boxTopRight.shift(0, width * 0.5);
+  points.fold2Right = points.boxBottomRight.shift(0, width * 0.5);
+  points.topLeft = points.fold1Left.shift(90, width / 2 - 1.5);
+  points.topRight = points.fold1Right.shift(90, width / 2 - 1.5);
+  points.bottomRight = points.fold2Right.shift(-90, width * 1.5 - 1.5);
+  points.bottomLeft = points.fold2Left.shift(-90, width * 1.5 - 1.5);
+  points.cutRight = points.fold2Right.shift(-90, width / 2 - 1.5);
+  points.zig = points.cutRight.shift(180, width * 0.6);
+  points.zag = new Point(
+    points.bottomRight.x - width,
+    points.bottomRight.y - width * 0.6
+  );
+  points.cutLeft = points.zag.shift(180, width / 2);
+  points.cutBottom = new Point(points.cutLeft.x, points.bottomLeft.y);
+  points.fold3Left = new Point(0, width * 1.5);
+  points.fold3Right = new Point(points.cutBottom.x, width * 1.5);
+
+  paths.seam = new Path()
+    .move(points.topLeft)
+    .line(points.topRight)
+    .line(points.cutRight)
+    .line(points.zig)
+    .line(points.zag)
+    .line(points.cutLeft)
+    .line(points.cutBottom)
+    .line(points.bottomLeft)
+    .close()
+    .attr("class", "fabric");
+
+  paths.outline = new Path()
+    .move(points.fold1Left)
+    .line(points.boxTopRight)
+    .line(points.boxTip)
+    .line(points.boxBottomRight)
+    .line(points.fold2Left)
+    .move(points.boxTopLeft)
+    .line(points.boxBottomLeft)
+    .attr("class", "dashed");
+
+  paths.folds = new Path()
+    .move(points.fold3Left)
+    .line(points.fold3Right)
+    .move(points.boxBottomRight)
+    .line(points.fold2Right)
+    .line(points.boxTip)
+    .line(points.fold1Right)
+    .line(points.boxTopRight)
+    .attr("class", "dotted");
+
+  // Complete pattern?
+  if (complete) {
+    // Title
+    points.title = new Point(length / 4, 0);
+    macro("title", {
+      at: points.title,
+      nr: 10,
+      title: "sleevePlacketOverlap",
+      scale: 0.6
+    });
+
+    // Button
+    points.buttonhole = new Point(length / 2, 0);
+    snippets.buttonhole = new Snippet("buttonhole", points.buttonhole).attr(
+      "data-rotate",
+      90
+    );
+
+    if (sa) {
+      paths.sa = new Path()
+        .move(points.bottomLeft)
+        .line(points.bottomLeft.shift(180, sa))
+        .line(points.topLeft.shift(180, sa))
+        .line(points.topLeft)
+        .attr("class", "fabric sa");
+    }
+  }
+
+  // Paperless?
+  if (paperless) {
+  }
+
+  return part;
+};
diff --git a/packages/simon/src/sleeveplacket-underlap.js b/packages/simon/src/sleeveplacket-underlap.js
new file mode 100644
index 00000000000..daea8bcec70
--- /dev/null
+++ b/packages/simon/src/sleeveplacket-underlap.js
@@ -0,0 +1,68 @@
+export default part => {
+  // prettier-ignore
+  let {store, measurements, utils, sa, Point, points, Path, paths, Snippet, snippets, complete, paperless, macro, options} = part.shorthand();
+
+  let width =
+    options.sleevePlacketWidth > 20 ? 10 : options.sleevePlacketWidth / 4;
+  let length = measurements.shoulderToWrist * options.sleevePlacketLength;
+
+  points.midLeft = new Point(0, 0);
+  points.midRight = points.midLeft.shift(0, length);
+  points.fold1Left = points.midLeft.shift(90, width);
+  points.fold2Left = points.midLeft.shift(-90, width);
+  points.fold1Right = points.fold1Left.shift(0, length);
+  points.fold2Right = points.fold2Left.shift(0, length);
+  points.topLeft = points.midLeft.shift(90, width * 2 - 1.5);
+  points.topRight = points.midRight.shift(90, width * 2 - 1.5);
+  points.bottomLeft = points.midLeft.shift(-90, width * 2 - 1.5);
+  points.bottomRight = points.midRight.shift(-90, width * 2 - 1.5);
+
+  paths.seam = new Path()
+    .move(points.topLeft)
+    .line(points.topRight)
+    .line(points.bottomRight)
+    .line(points.bottomLeft)
+    .close()
+    .attr("class", "fabric");
+
+  paths.folds = new Path()
+    .move(points.fold1Left)
+    .line(points.fold1Right)
+    .move(points.fold2Left)
+    .line(points.fold2Right)
+    .move(points.midLeft)
+    .line(points.midRight)
+    .attr("class", "help");
+
+  // Complete pattern?
+  if (complete) {
+    // Title
+    points.title = new Point(length / 4, 0);
+    macro("title", {
+      at: points.title,
+      nr: 9,
+      title: "sleevePlacketUnderlap",
+      scale: 0.6,
+      append: true
+    });
+
+    // Button
+    points.button = new Point(length / 2, width / 2);
+    snippets.button = new Snippet("button", points.button);
+
+    if (sa) {
+      paths.sa = new Path()
+        .move(points.bottomLeft)
+        .line(points.bottomLeft.shift(180, sa))
+        .line(points.topLeft.shift(180, sa))
+        .line(points.topLeft)
+        .attr("class", "fabric sa");
+    }
+  }
+
+  // Paperless?
+  if (paperless) {
+  }
+
+  return part;
+};