OlcroySupport us

Pattern generator · Pattern drafting software

A pattern from your measurements

Pick a garment, enter your measurements, download a full-size basic block. Free, in the browser, no sign-up.

Open source · Your measurements stay in your browser

01020315 × 15 cm
Close-fitting bodice block (Aldrich), size 12 EUBust 88 · Waist 70 · Back length 41 cm

Pattern generator

Which block will you start from?

Click a garment and the generator opens on it. Everything is calculated in your browser; your measurements are not sent anywhere.

  1. GarmentBasic blocks for women’s and men’s clothes by the M. Müller & Sohn and W. Aldrich methods: a foundation for your own design, not a finished garment pattern.
  2. Size and measurementsChoose a size or enter your own measurements. The generator flags measurements that don’t add up.
  3. PatternA full-size PDF, tiled onto A4 sheets or as one sheet for a plotter. SVG and Olcroy files for further work.

The generator is made for a computer with a mouse. It opens on a phone, but the draft is small and awkward to move with a finger.

Pattern drafting software

Olcroy, based on Valentina

Free, open-source pattern drafting software: measurements, drafting and piece layout.

Download for WindowsVersion 2026.1-b.1 · 27 MB · Windows 10 or later, 64-bit
Other systems:LinuxAll files and version history
More about Olcroy

For desktop computers only.

Learning

Lessons

How to take measurements, print a pattern and alter a design.

All lessons

About

Who makes Olcroy

Olcroy is made by people who sew and draft patterns themselves. We want a precise pattern from your own measurements to be within everyone’s reach, so the generator and the software are free.

Community

Questions and discussion

A Telegram channel with project news, and email: ask a question, show a result, report a problem.

Write to us: admin@olcroy.com

Support the project

The generator and Olcroy are free

If they help you, support us: give us a star, subscribe, tell people who sew about us. That is how more people find the project.

Report a problem

Tell us what went wrong. The more detail, the sooner we can find and fix it.

A mistake in the text? Select it and press Ctrl+Enter.

What we keep