This year, 2007, I transformed myself into a zombie and my wife transformed herself into a tourist. My costume was a tad small, but it's not like they comes in a whole large variety of sizes. To them, you're either a kid or an adult. And, as is typical with these costumes-in-a-bag, the picture on the package is extremely misleading as to what the costume actually looks like. Still, it looked pretty good in the dark, which you don't get to see due to the camera flash.
And just so you can see how deceptive they make the picture advertising my costume, here are some comparison shots: