Thanks papillon but.. :/ It literally says "check the readme to see which parts are used" multiple times. This tutorial doesn't actually tell you how to figure out for yourself which parts the mesh is trying to use or which parts to select. My problem is that I followed the readme to get these items in game (and did everything in this tutorial) and there's still a problem. Oh well. I can live with it, the outfit is just that fabulous.
Jac - It's both a body part and a piece of clothing. Right? Because to make clothing you have to create a body part.. I think.
Oh, I just read that someone else (http://planetelderscrolls.gamespy.com/View.php?view=Mods.Detail&id=8417) is having the same problem. The author says to contact him for troubleshooting. Maybe I'll try that.