Just one quick story about a short skirt. I was at a Chinese auction. The woman in charge was wearing a skirt that just covered her knees. Barely.
The problem was she was standing on a stage. Those sitting in the first row could see halfway up her thighs. Luckily there were no men there. But it was still not appropriate.
One must be careful to consider where one will be when choosing what to wear. Something that may be okay in one context might not be in another.