I recently decided I would learn to sew my own swimwear and bras since most of what fits me is horribly ugly and overpriced... I'm in my 20's, fit/5'8"/narrow ribcage/large cups. Forget about factoring support into the equation.
After 10 years of spending hours and hours every spring/summer looking for the perfect fitting bikini, I realized that in that same amount of time, I could learn how to make my own swimwear and be set for the rest of my life. "give a man fish he's fed for a day, teach him to fish he's fed for life"
Going through bra and swimwear patterns, I've learned that the construction ranges from simple to very complicated. Unfortunately, nobody in the industry appears to be doing anything that's particularly interesting or ground-breaking. Very little that appears to be designed by and for a large-busted woman. Patterns are classic, even corsetry-inspired. No new construction methods or materials. Too bad because there is a huge market for supportive and attractive bras - "of the future"?
Lululemon has some great sports bras that are very supportive and cute and the price is reasonable. I wish more companies would follow suit.
What I'd really love is supportive bras with moisture-wicking materials covering the underwire. I have no idea why no companies that I know of, other than Lululemon, have capitalized on this. It's so obvious to me!