You've always liked bears for their fierceness and strength, so when you see a costume with bear on it while you're flipping through the costumes, you figure that's as good a choice as any costume. You pull it off the rack and throw the label off, then start getting into it.
It's a pretty simple costume, the bulk of it is just a full-body suit covered with brown fur, with the gloves and boots attached, and a tiny nub of a tail sticking out of the back. Taking a quick glance to make sure your uncle hasn't wandered into the room with you, you strip mostly naked, except for your underwear, and get in. You look in the box the costume came in, but the only other thing in there is a headband with some bear ears on it. Shrugging, you put it on, but you're a little disappointed with how simple the costume is. You go to look at yourself in a nearby mirror when you feel a weird sensation in your guy that spreads through your whole body. Is this what your uncle was talking about?