I'll give you the shirt off my back.

At the costume shop, we are strongly encouraged to dress up for work. By dress up, I mean in pseudo-costume, usually a mix of your own stuff and stuff at the store.
Yesterday, I came in wearing my white Dickie's capri's with crazy black zipper pockets, my Converse All-Stars (appropriately ratty), a studded belt, and my essential black v-neck. I then became an 80's rocker with the addition of a pink and black wig from work and an amazing black and white leather driver's cap.
Today, I came in my aqua 50's waitress dress (that I acquired in Europe for 6 Euros), my ripped Rocky Horror fishnets, a little black cardigan, and my ever-so-ratty Converse. I added a tacky pink apron with little flowers, a white neckerchief, and these terribly guady gold cat-eye glasses with little gold flowers around the corner of each eye. 3 girls said they wanted to look like me for Halloween. And to the last one, I literally rented the dress off my back. My boss said that if I was willing to rent my dress, she would go half with me on the rental price. So for five minutes I wore one of the kimonos in shop (with the gold glasses and the neckerchief) while the customer tried on my dress. So my waitress dress (with the name "Chrystle" embroidered over the left breast) was rented out today for $24. I'm cleaning it, and bringing it with me to work on Thursday. This dress has already paid for itself twice over--and I've only worn the thing once!

Possible work-costume ideas for the Halloween weekend:
Thursday/Friday: Pink Ladies
Saturday: Alex from A Clockwork Orange (just so the white zipper Dickies can make another appearance)
Sunday: The Bride (providing the bastards at Miramax actually get my costume to me by Friday!)