Lost Armor .
Wait, how long has it been since you logged in?
You may want to google “GW2 WARDROBE” because now we have the wardrobe system that handles all the skins, but some skins bugged and got lost.
You’ll need to log into all your characters and go into PVP area on each of them to add their individually aquired skins to the wardrobe.
It was a skin Kael, all the pvp skins were automatically added to your wardrobe when they merged the spvp and pve skins.
Though you could possibly have been hacked, but anet would have sent you an email about that I think. Anytime someone tries to log in from a different IP I get a warning message.
It sounds like Kael Dghar FireBolt purchased some armor with Invader’s stats, which means it wasn’t an armor skin, and it was purchased in WvW.
@Kael Dghar FireBolt, the forums won’t be able to help you recover your items. If anyone, you’ll have to contact customer support. Good luck!