1. The Ipod Dancer: This "costume" involves minimal effort and won't require you to expend any $. I wish I could say I thought of this myself, but an ingenious friend of mine actually showed up to a Halloween party two years ago dressed like this. The level of easiness/laziness really impressed me!
All you will need for this costume is:
1. Black Cotton Shirt (the planer the better). Long sleeves probably works better.
4. Your Ipod. The white headphones are key! A major plus of this "costume" is that you can listen to your own music if the DJ sucks!