DRESS FOR COMFORT: If you'll be walking all night, stiletto heels aren't the best bet to go with your sexy nurse costume. And if you can't sit down in your costume, trips to the bathroom will be even harder.
TAKE ENVIRONMENT INTO ACCOUNT: Keep in mind whether you'll be inside or outside, in open spaces or crowded places. Will your costume prevent you from seeing where you're walking? Will it irritate people around you if you keep bumping into them? Consider accessories that will help keep you warm if you'll be trick-or-treating. Let your Wilma Flintstone have a leopard-print coat (try a fluffy bathrobe) or just pick a warm costume to begin with: skiier, marshmallow, cloud or animal (full-body mascot costumes can be quite toasty).
WEAR A BIG HEAD: Never wear a big head, no matter how great the costume looks, Ms. Hattman says. Driving is impossible while wearing it, and if it's damaged, it costs a lot to replace, she said.
MAKE PEOPLE GUESS: Pay attention to details so that others don't have to guess what you're trying to be. For example, the difference between a pirate costume and a vampire costume: A pirate costume should be flamboyant, the vampire more tailored. The vampire will also have teeth, the pirate, a tricorn hat.