Looking for a simple Mean Girls Halloween costume idea? These two clever looks are easy to DIY with items from your closet and a few craft-store supplies. Instead of just dressing as Regina George, try becoming the Burn Book itself — and don’t forget Karen’s unforgettable “I’m a mouse, duh” outfit. Below are quick overviews and links to full tutorials to help you recreate both costumes with minimal effort.
Karen Mean Girls Costume Idea
The costume party scene in Mean Girls made Karen’s mouse costume iconic. This look is one of the easiest to recreate: an old t-shirt, iron-on letters, and a pair of mouse ears are all you need. It’s affordable, comfortable, and instantly recognizable — perfect for last-minute plans.
Get the full I’m A Mouse, Duh costume tutorial here.
Mean Girls Burn Book Costume
If you want something more original than dressing as one of the Plastics, turn a pink dress into a Burn Book costume. It’s a creative twist that people will instantly recognize and admire. The look works great for solo costumes or as part of a duo.
A free printable for ransom-note–style letters is provided so you can print, cut, and iron them onto your outfit to recreate the authentic Burn Book aesthetic. This approach keeps the costume crafty but polished.
Get the full Burn Book costume tutorial here.
Costume Ideas for Duos
Heading to a party with a friend? These two Mean Girls costumes make a fantastic pair. If you want additional BFF costume inspiration, consider group or couple ideas that are equally fun to assemble and wear.
- 22 DIY Group + Couple Halloween Costume Ideas
- Unique Halloween Costumes for 3 People
- DIY Lisa Frank Costumes
- DIY Milkshake Costumes
- DIY Soda Bottle Costumes
Pop-culture costumes are always a hit, whether you’re channeling 90s toys, Troop Beverly Hills, or these playful Mean Girls looks. Both costumes are easy, budget-friendly, and great for making an impression at any Halloween event.
Happy Halloween!