This is pretty for a casual look. The link is teh onecalled silver dor belted skimp dress. cute! For the wedding one... hmm Hope you like em! good luck!
That's a tough one. What kind of job is this for? Sounds like a trick to me. I would avoid being "VERY casual" and go with some kahkis, a nice polo and decent shoes. That way, you look more dressed up than usual but not in a full out suit.
Sweaters and button up collared shirts are appropriate, slacks, and nice dress shoes, never sandals or tennis shoes. Another way to find out what is really appropriate for your office, is to dress conservatively your first couple weeks and check out ...