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---
title: Parametric pattern design
order: 10
---
The FreeSewing core library is a toolbox for **parametric pattern design**;
Using parameters or variables to manipulate the outcome of a given design.
In sewing patterns, the parameters are what is provided by the user:
Their measurements and options that they have selected.
<Note>
##### No more grading, ever
When drafting or designing patterns or garments, it is common practice to start
with a fit model (or dress form).
The measurements of the fit model are used as input in the initial design.
Adapting the pattern for a different model is a tedious task,
which is why patterns are graded up and down to cover different sizes.
But in a parametric sewing pattern, adapting to different sizes or models *just works*.
</Note>
FreeSewing patterns are implemented **as code**, which has a lot of advantages.
It allows for patterns that adapt to your measurements or preferences,
fine-grained version control, seamless collaboration, and using existing
patterns as a starting point for you own, to name but a few.
That being said, you don't have to be a code monkey to use FreeSewing.