Before drafting your pattern, you’ll need to print out a set (or at least your size) of graduated ruler. You’ll want to use the ruler corresponding to your breast / chest size. So for example, a 42″ chest would use the size 42 ruler to draft the pattern.

The most important part of printing is to ensure the files are printed at 100% scale. These are 11×17″, so that means if you’re on a home printer with letter sized paper, a good deal of the rulers will just be cut off and not printed. I’ve never had a problem with that and just use the portion of the ruler that does print.

Double check that the ruler is printed out correctly by comparing the size 37 1/2 to a regular ruler – they should be exactly the same.

You could also bring it to a copy shop or office supply store and have them print it out for you.

Here’s a short video explaining the rulers in more depth.