The cape has an emote. The cape must be worn in order to perform this emote. The Invention hood can be attached to the cape by using one on the other, creating a hooded invention cape (t). It can be detached with a right-click option. Talking to Doc gives an option to toggle the appearance of the cape to a retro version, overriding the normal appearance and making it look similar to how the other skill capes did before the 2015 graphical update. Despite it being a new item, the retro cape can be used with a keepsake key.