When I click the Restore button in the avatar creator, it just unequips all my items.
I tried re-equipping them and saving the outfit again. But even if I click Restore right after, it just unequips all items again. This happens on both Firefox (44.0.2) and Chrome (48.0.2564.109) under Windows 7 for me. Cookies and scripts are allowed for the site. Deleting cache and cookies didn't help.
The Reset button in stores is working properly though (although it doesn't reset to the avatar I am currently wearing, but to the (unsaved) avatar I last made in the creator).