Very useful if you think your Tama is an ugly character...lol
If you put it on, it stays on for the rest of the day (so don't panic!)
The costume will come off when your Tama falls asleep at night.
If you want to take it off sooner, just change the tama's clock to it's sleep time, and once it is asleep, change the time back to normal. The cozzie will be gone