User blog comment:ACWeapons/How much armor would RWBY characters need?/@comment-5414218-20151211140736

Well, technically with Aura you don't need an armor and the lighter your clothes are the better since they give you better mobility and comfort. As someone who has practiced martial arts for years I tell you that the difference in clothes can be really noticeable.

All that said, if we are going just for a cool factor, Pyrrha's and Ren's look pretty good in my opinion.