As implied, both the Gold Chapeau and Tabard. My second attempt at selling this off, hopefully it'll go cleanly x)

For Set:
Current Offer: 15.5k CE (in-game offer)
Buyout: 17k CE
Minimum increment: 0.5k CE

Chapeau Only:
Starting Bid: 5k CE

Tabard Only:
Starting Bid: 3k CE

CE offers only please; either post here, or mail/tell Argonwire in-game. This'll end in just over four days (June 29th, 20:00 GMT, 12:00 Forum Time), so best of luck xP.

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Edit: As some people have shown interest in just buying one part, I'll now allow individual bids on them with no buyout. The winner will be the set purchaser, unless the combined Chapeau and Tabard offers are worth higher.