There doesn't seem to be a way to tell with the costumes in the Questionite Store whether or not you alreeady have a given costume piece. Anyone know of a way, short of actually buying the piece so you can see if the mask is blue or grey?

Check at the tailor?

Only way i know of is to hit the tailor and click on the treasure chest tab. Then sort by name and scroll.
I tend to grab a post it note and jot down the ones available, then check them off as i catch 'em all.

If there's a simpler way...i wouldn't mind finding out either...

This is rather odd. On my client I have no trouble telling which pieces I've already unlocked, as the ones I've bought are both greyed out on the questionite store and list 'you have already unlocked this costume piece' on a mouse-over. Are you sure yours doesn't do the same?

Just managed to get on this evening (after about a half hour of trying to load the launcher :() and double checked. Tuesday I had purchased the "Serpent Lantern Emblem 2" as a test, and fortunately it was not one I already had, and I click the icon in my inventory to unlock the costume piece. Now that piece still looks the same in the Q-Store (some of the Action Figures above it are greyed out, and they are AFs I already have), and when I mouse over it, all I get is the name of the item, that it unlocks a costume piece, is BOE, can't be sold, and right-click to bind. Nothing says that I have that costume piece unlocked already.

After a quick hop over to the penthouse to check the closet, I find I have a different problem: The Serpent Lantern Emblem 2 is not listed in my unlocked costume pieces, and the only unlock in my emblems (apparently things purchased in the C-Store don't count as "unlocked") is from Takofanes. Also, no Serpent emblem there.

There seems to be a bit of confusion here, I think many people don't consider the Serpent Lantern and Demonflame costume pieces as "Questionite store" costumes because they were originally (and still are) available in the Until HQ from the Until Token vendor. The costume pieces that tell you if you already have them unlocked or not are the Cyberpunk costume pieces.

That being said, the only way to know if you've unlocked costume pieces is to look up the Serpent Lantern and Demonflame costume pieces entries in the wiki and check the tailor manually.

Serpent Lantern Emblem 2 unlocks "Viper Logo Large", so you'll have to search for that instead.

Part of the trouble is nothing is consistant. All the new costumes available from the token vendors are bind on pickup. So there are tool tips available telling you if you have the costume or not

The Serpents Lantern/Demonflame costumes are BOE allowing you to trade or sell them. The problem is that because you can have more then one. There are no tool tips to tell you if you have the costume already

Worst case. If you buy the wrong costume you can always sell it to another player.

Thanks for the info! I have now found the Viper Logo Large, I was expecting it to be under emblem as a pattern, not as a type of emblem. Too bad they don't name these things consistently.