What you need: tacky clothes and a fanny pack

Honestly, just strap a non-ironic fanny pack on your waist and you’re good to go. But if you really want to go all out, find some Hawaiian shirts, pair them with khaki cargo shorts, some bright white sneakers (preferably with equally bright white socks pulled up to your shins) and finish the look off with a solid belt. If you have a camera lying around, you can go around your Halloween party pretending to observe your friends in their natural habitat and annoy everyone you know.