I have made swimsuits, panties, and slips. Martha Pullen has heirloom stitching patterns, and Stretch and Sew has patterns for use with stretch knits, ie nylon tricot. They are all simple and multisized. Try it. I have never made bras because I could not find the various notions needed, but Threads Magazine had an artiicle on making bras several years ago and they archive their articles. Good luck.