I think it is quite common to try to draw attention to whatever we think our best attributes are. Women do it with breasts, guys do it with muscle T-shirts (Assuming they have muscles), and women with great legs have more of a tendency to wear shorter skirts. It may be to get attention, but it could also be to draw attention away from less desirable areas of the body. We accentuate our assets. Women use push up bras, or padded ones, and guys may opt for tight-fitting jeans, if they think it shows off something.
At any rate, how much is acceptable is probably relevant to the situation. In Hollywood on the red carpet, it seems the more revealing, the better, although, a few choose a more subtle display. However, a revealing look just wouldn't be appropriate for a teacher to wear in any classroom.
Some people feel more comfortable with their bodies than others, and are not so concerned with what others think, so they dress in a way that suits them. Taste is largely subjective with fashion, food, music, and art. To each their own.