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57 Best Group Halloween Costumes by Group Size (and Who You’re With) Looking for the best group Halloween costumes in 2025? Whether you're hitting up a party with your best mates, dressing up with the kids, or coordinating a themed office day, matching group costumes are always a crowd-pleaser. From low-effort laughs to wow-factor pop culture references, this guide has ideas for every group size, and every kind of group dynamic. Trio Halloween Costumes Three’s not a crowd when it com …