We secretly suspect this is because the bodies underneath the clothing rather than any sort of actual style involved in the outfits, but in any event: women like athletic clothing, apparently.
The Takeaway: Stay fit and wear clothes that show it off, both in and outside the gym.
How to Perfect It: As a general matter, unless you are muscular, do not opt for tight-fitting athletic gear -- it can look strange and boney. If you are rather thin, a basic sleeveless t-shirt can be sufficient.
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Had a pair of Carhartt B-11 jeans (dark blue) and they were wonderful. The only real downside about the Carhartt line is that you won’t likely find them when you Google ‘jeans.’ You have to go to ‘workclothes.’