Authors Note: We've been focusing too much on the girlfriend, so let's change how we want to dress as this time.
Your girlfriend started getting an idea, before she could pick something out. "I just thought of something," your girlfriend says. "How about we pick out the costumes for each other. I'm sure we can tell what we want to get each other." You agreed, and smiled knowing that it was a good idea, because you want her to be happy with the choice you made.
When you get to the aisles of the shop, you found that they had a bunch of costumes for you to put on, and dress yourselves up as. Ranging from skinsuits, to fursuits, to superhero costumes, to clothing of either gender. You were still unsure what to get your girlfriend though, but you decide to wait for what your girlfriend chooses for you, before you could do anything else. "Oh babe, I selected a costume for you," your girlfriend says, and you turn to see what she has chosen for you, while you were doing the same for her."