As dress codes loosen up and temperatures rise, we've noticed women pushing their work attire to the limit. We started wondering: are tank tops fair game? And how can you tell if a skirt is too short? Every office environment has its own set of fashion rules, so here's some tips from the ladies behind the popular fashion site "Who What Wear" and the helpful new handbook, "What to Wear, Where" to get the scoop on general wardrobe guidelines for the work place. Here are their seven fashion don'ts for the office.