User blog comment:TeamTaycobSoDealWithIt/Breaking Dawn - Part 2 spoilers!/@comment-4220399-20120712171153/@comment-96.254.84.211-20120717044347

Actually he did strip down in front of Charlie to phase in front of him. He was trying to prepare him for the possibility of "monsters" before Charlie would meet Bella as a vampire

It wasn't like some creepy strip tease or something, though! (At least not for Charlie!)