I was out with some girlfriends for a night of dancing this weekend when we saw a woman dancing wearing a crop top. Now I understand that every woman wants to go out and feel sexy. Crop tops are not the way to go about doing so, even if you are skinny. First, it's not pretty to be hanging out and showing everything off. Secondly, crop tops haven't been in style since the 1990s and even then it was a risky judgement call.
Appropriate bar style starts with wearing clothes that fit you. Please avoid dressing in skin tight clothing that are three sizes too small. Rolls (everybody gets them, skinny or fat) are not attractive. Most importantly, please avoid clothing that reveals too much. The entire club doesn't need to see your vajay-jay to know you are sexy.