Designing Apparel Through Flat Pattern Design, New York : Fairchild Fashion & Merchandising Group Collection 1992.

You can find used copies online from independent sellers but it is also available on the Internet Archive here

My recommendation for a pattern making book accessible to home sewers is Designing Apparel Through Flat Pattern Design, this was my pattern making textbook at FIT in the 90’s, it cost me $50.50 back in the day. I believe this is out of print. I have the one from 1992, there are previous editions. I get a lot of questions on this topic from sewers who usually gravitate to Helen Armstrong's book for whatever reason..... but to be honest I think it has too much in it, it is very mass market, with kids, knits, and jeans, etc. Sure I know you want to have it all but it just has too much. Designing Apparel is simple and classic dressmaking. The shapes and cuts can be reinterpreted, it offers all you need to get started. Keep it simple. Pattern making can be a lot at first so why overwhelm yourself with Armstrong’s book. Don’t complicate your sewing life.

Something to consider however…Designing Apparel does assume you have a sloper or a basic block of patterns from your measurements - bodice, sleeve, skirt, pant. If you really want to produce clothing that is custom fit - do yourself a favor and sign up for Lynda Maynard’s Moulage class, her current class schedule is here. This class will give you a custom fit sloper (once you add ease) that you can use in flat pattern design. Also remember flat pattern making is not a jet pack. You will still need to do at least one muslin maybe two. In most cases flat pattern will get you close to where you want to be, then make adjustments in the muslin and from there get creative, try draping.