this theory needs to account for why the fashion industry takes as its ideal of beauty anorexic women/girl who look like boys......
Well, that's simple: the fashion industry is geared towards women, not men, and the women like smaller hips and think it's more beautiful.
The fashion industry is run by gay men who takes as its ideal of beauty the more narrow mens/boys hips.
The most profitable sector of the fashion industry is geared toward teenage who are barely physically women who are not completely physically developed.
Hence the juniors dept vs. the misses department in department stores.
Junior sizes run by the odd numbers, size 5, 7, 9 etc.
Misses run by the even numbers 6, 8, 10 etc.
If you're a woman who wants to wear the more young looking fashions and go into a juniors dept., if you wore a 10 in misses, you're a 9 in juniors.
Some women may shop in the juniors department, but for more casual clothes, t-shirts, pullovers, jeans, etc.
What they find there, and what eventually causes women to veer away from that department, is that the clothes are more trendy, meant to be bought often and the styles quickly change, bringing in more money to the fashion industry.
The misses department carries trendy clothes as well, but is more geared to women who have figured out what styles they look good/feel comfortable in, and and going for higher quality, longer wear.
There's nothing wrong with liking women with small hips.
Nothing wrong with liking medium and big hips.