I haven't looked closely at how pioupiou's mod work, I only glanced at the description. I'm assuming then that only custom skins use the S3 werewolf texture, and the maxis default skins stick to their original skins.
Give me a few minutes and I'll do alpha edits of the other textures as well. I could have done that from the start but I had been hoping to keep the file small...
Edit: As suspected, the file is too large to upload here. It's still small my most standards; 1,33MB (compressed), 1,18MB zipped, but too large for Pescado's rules. I can't stand most free hosts, so I'm going to see about uploading to MTS2, but then I'll have to do some real testing, and get some good screenshots first.
Edit 2: http://www.modthesims2.com/showthread.php?p=1682314