I am reposting this issue, so that it stays relevant as the bug has not been fixed. Hopefully someone at Blizzard sees this.
Original text: Ever since the launch of 10.2.5, a visual bug has been afflicting Zandalari Trolls that causes their helmets to appear at least 25% larger than normal. It has a very disconcerting effect on several helmets, most notably goggles, glasses, and monocles/eyepatches. The size change is less notable in bigger helmets but all of them do possess the same visual bug. I’ve been reporting this every single day I log into the game. Please help to fix my character’s transmog, Blizzard!