Last year both my husband and I were working and we put together some really great costumes -- I sewed his wizard costume from scratch as well as my ultra-gorgeous witch costume.
Now, I'm retired except for writing and musical gigs, so not as much money. So instead of buying new material for costumes, we traded for this year. I get to be the wizard -- he'll be the witch! Very few alterations because both costumes were loose to begin with.