What age group is this costume for?
Preschool and Younger
Elementary School
Middle School
High School & Beyond

Estimated time required to make this costume:
Just shopping for identical outfits.

Difficulty level:
Quick and easy - no sewing required

Items you will need: (Hit your return key to start a new line)
~identical shirts and pants (you may want to do blue and red for angel and devil)
~for the evil twin, devil horns
~for the good twin, a halo

Instructions:
Just put on your costumes and PAR-TAY!!!

Other information to consider:
You may need to do some explaining as to WHY, EXACTLY, you two are almost wearing the same thing but not quite.