I know many women who prefer being comfortable, they sacrifice style for that. Clothes that are two sizes bigger, dark colors, and loose fits.
I prefer trends and can sacrifice comfort for looking the best I can. It's not about being vain, but it's just a preference.
Do you like being comfortable? Would you wear a really short dress or tight trousers just to look good even if you can't breath? Are we past the Victorian times when women used to wear tight corsets regardless of how much it killed them?