Capes are worn on the back, the 9L slot. They can be worn along with a backpack. Some come with a Hood which takes up the 1L (headgear) slot as well. Notable Capes include:
The Dev Cape or Merchant's Cape is a bright pink cape that has no stat buffs or gilding slots. It can only be obtained by a developer gifting it to you.
The Legacy:Xanadu Hound's Cape is a since deprecated and unobtainable cape from Legacy.
The Creel isn't actually a "Cape", but a wearable container with specific inventory that only holds fish. It's listed here because it uses the Cape slot.
Below are all Capes in the game.
|Ant Queen's Wings||No||9L or 7R|
|Hussar's Wings||No||9L or 7R|
|Swan Feather Cape||No||9L|
|Bear Cape||Yes||9L & 1L|
|Cave Angler Cape||Yes||9L & 1L|
|Lynx Cape||Yes||9L & 1L|
|Ranger's Cape||Yes||9L & 1L|
|Reindeer Cape||Yes||9L & 1L|
|Walrus Cape||Yes||9L & 1L|
|Wolf Cape||Yes||9L & 1L|