Note: I design swimwear for women. I know how boobs work. Bras are complex because boobs are complex. Let me run your through some of the mathematics. Take a look at this website: Bali Women's Double-Support Wire-Free Bra #3820 | Amazon. read more
There are simply so many factors like the shape, the fabric and the aesthetics, all to be considered for a bra to be salable. I don't know if this is the answer you were looking for, but the sheer demands on the product make it complex. read more
But this is the really tricky part: how good a sports bra is depends on what you're measuring. For White, the quality of a bra has everything to do with the comfort of the user wearing it. But for brands, that's not the only consideration. Sports bras aren't just a piece of sports equipment. read more