lol this turned into a request thread. I'm pretty sure he said he'll put it on Jigglypuff guys.
Yeah. The main reason I chose Jigglypuff is because it and Pikachu are the only two characters that get new props for alternate costumes. Aaaaand another reason was because one of its alternate costumes has the hat as a separate model (green team / sleep hat). I had originally tried it on a different costume, and... Well, let's just say that after rebuilding the MDL0 to have larger entries, if
one thing is not linked properly for whatever reason, it ain't gonna work properly. (I still don't know what went wrong.)
Oh, and as for why I chose Bill's hat out of all the ones available in Team Fortress 2... First of all, my real name's Bill, Bill's my favourite character in Left 4 Dead, and it's the only way I'll ever be able to wear that hat (since it's a bonus that you get in TF2 for pre-ordering Left 4 Dead 2, which didn't do). XP
Haven't tried anything with Pikachu yet, but I'll try that later.
That would be perfect for the Dr. Mario that's being worked on, so I'll do that at a later time.