As some of you may already be aware, I spend my Saturdays docenting at the
International Printing Museum. I'm there from roughly 10 in the morning until at least 4 in the afternoon, frequently later, for no pay whatsoever (and indeed, I occasionally make in-kind contributions of paper for specific purposes). Because I do it of my own free will, and would do it (maybe without the in-kind contributions) even if it didn't get me access to the various printing and linecasting equipment there for personal projects*, I am a volunteer. If I were being coerced into doing it, I would be a slave.
Same thing. If apparel intended to incite sexual interest (or to deter it) is worn by choice, it can be liberating and/or empowering. If it is imposed upon an unwilling wearer, it becomes objectifying, whether it's a miniskirt or a burqa.
That said, I find an awful lot of fashion choices utterly inexplicable.
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* You read that right. At the Museum, we not only tolerate docents and staff using the equipment for personal projects, during public hours, in full view of visitors, we actively encourage it, because seeing the equipment in use enhances the visitor experience.