The Dress Developer

Standard sizes don't work for you? On this website, you can create sewing patterns for your own individual measurements. And yes: it's completely free and uses very little data! If you want to know how and why I am doing this, you can find more information here.

Just want to try out the software? Then you can choose between sizes 32-60 (German sizes). You'll still have plenty of customization options, such as different styles, variations, lengths, and more. 

This video explains exactly how it all works.