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UPDATE March, 2, 2013: Still not fixed and got "sanction" threat in private message from French moderators on forum for asking about the bug in the support section (funny because I never insulted any time, it seems they want to delete any angry customer message regarding this issue). I have only one thing to say: TERRIBLE CUSTOMER SUPPORT. After investing more than $200+ in the gem store, and years of content in Guild Wars 1, I can't believe they are treating me like this. All we want is ANET to communicate and tell us when our purchases will display again, we just need ANET to tell us something, even if the planned patch is in 3 months from now...being ignored and sanctionned is not the way ANET should deal with these things IMHO
NEW EDIT: So I learned why this bug is happening. Head gear for town clothing does not display anymore because they removed the ability to hide helmet (which is a good move since anyway, town clothing parts do not need to be turned on/off individually! We should just equip/unequip the parts we want since town clothing doesn't have "stats" contrary to regular gear anyway) but they completely forgot that some people had turned head gear off before this (for example, some people didn't want to display the pirate hat from their pirate costume), which means affected customers are now unable to see head pieces they purchase / purchased. Which is even worst IMHO... this is really silly. How could a developer think like "hey, we're going to remove the ability to hide helmet" without thinking one second about the people who currently have it set to "hidden", of course they will be unable to "turn it on" thus won't be able to see their cosmetic purchases after such update! It's not like A-net are amateurs or something, c'mon... Also, it doesn't take much time to fix. They just have to update their database for all users (TownClothingHeadSlotDisplay=1 or whatever it is called) to force every people to have their gear 'on' again. This kind of things doesn't take 2 weeks to fix...
EDIT: because of the first replies below I must insist on the fact that it's impossible to turn on/off head gear display (see my screenshot below) and recognized as a general bug affecting many players by the ANET moderator (see other screenshot below)
I paid for cosmetic head gear but it won't display. It's been 2 weeks now.
Same problem with EVERY town clothing I own (pirate hat etc.). Town clothing head gear don't display anymore since before the update that introduced the "riding broom".
French community manager said ANET recognized this bug is affecting many players, they'll fix it but don't know when:
Why we are feeling left out...3 days ago they patched the game and even added new items to the Gem Store but still didn't fix anything. I paid for an item that won't display, and 15 days after, still no news / no update.
Invisible "Bunny Ears" - how awesome is that: