First, they came for the biologists wrote:
Does my wife think putting on lipstick and heels to head to the office is any way sexual? Not in the least. It's literally the furthest thing from her mind as she's just trying to get out of the house with the kids in the morning. That doesn't change the fact those two things are still signaling to other males. Should she have to do that to appear professional? I would say no, that's part of the patriarchy I've fine with dismantling. Having women appear more sexualized for the delight of men is wrong. But what you're advocating goes to far. That women can have unlimited freedom to appear as sexual as they want and have no responsibility to comprehend how they'll be received by men. Do bun huggers go too far? I'd say no, but if you're not willing to understand the signal they send you're being purposefully obtuse.
Bun huggers and high heels are different in kind, not just degree. Buns are unquestionably high performance clothing first and foremost. It's not like some track executives decided that women should show more skin for ratings and the tradition stuck (like with beach volleyball). Buns are no more inherently sexual than performance swimsuits.