Well different strokes for different folks, I guess. Some people have different views on what is aesthetically pleasing in fashion, and skin can be revealed in very classy and stylish ways.
We have had many debates on the forum and blog about how much is too much, and it is clear from this that many people hold differing opinions on this topic. I'm of the opinion that lots of skin in work is not appropriate but outside of the workplace, wear what you wish especially when you're twenty because you're still young and can experiment wildly with your style.