This site has very detailed instructions on drafting a custom bra pattern.
Bra making tips for supporting large busts
Learn to make your own bra in the Bra-making Sewalong, a tutorial series at Cloth Habit
I've been sewing my own bras for about a year now, but I don't think I've ever written about it here before. I started s...
Sewing: Boylston Bra Take Two
The Sewing and Life Adventures of Emerald Erin: [BAW28]: Exposing the Unders: A Guide to Deconstructing Bra Design
The Secrets of Sewing Lingerie: Make your own divine knickers, bras & camisoles - sugar darlin
A sewing tip: Make lingerie with leftover fabric scraps!
Making a Foam Cup Bra: Part 2 - Cloth Habit
Resource guide for where to buy lingerie making supplies. The Sewing Loft