I really don't think that having men admire more voluptuous figures is limited by race. Most of the men I know, regardless of race, prefer a woman who looks like she's not afraid to eat. My husband says he can't understand why any man would find a stick-thin woman so attractive.
The answer is dumbfoundingly simple:
Most fashion designers are gay men. They prefer women who look like 8 year-old boys.
I don't understand it either but I've seen men in this very forum fawning over photos of Lara Flynn Boyle. She's the actress that looks like a Holocaust victim.