To make sure I got this right, there's a save wipe for 0.6 and there should be an NPC that will give us a Costume Ticket from 0.5.3? Or does that NPC appear with 0.6?
The NPC is no longer available once the 0.6 version launched. The NPC rewards was to compensate the save wipe. The rewards are Skin Tickets to immediatly unlock a skin (once available), all skins are unlockable in-game though. the Skin Ticket just skips the requirement for the skin of choice. I hopce that makes sense. So even if you missed the NPC you can still get all the skins by unlocking them in-game.