Easy Diy Group Costumes . Here’s a list of 30 clever group halloween costumes ideas perfect for the office, families, or groups of friends! This adorable, super easy costume is as simple as buying a black shower cap and hot gluing fake greenery to the top of the hat. 10 Trendy Easy Group Halloween Costume Ideas 2021 from www.uniqueideas.site See more ideas about halloween costumes, group halloween costumes, diy halloween costumes. From sushi rolls to the cast of pretty little liars,. Here are 19 cheap and easy diy group costumes you can wear with friends!!