My parents: Closet Rocky Horror fans.
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Considering I had to explain to my mom what the costume was based on, and then show her pictures of Space Riff, I don't feel too badly about it :)
I'm glad TWF beat me to the costume snobbery. But, really, they've never been to the show?
Never been to the show. Heard about it from the times my siblings and I have gone, but never seen it.

My mom found this old costume in a box in their room - Apparently, they wore matching costumes to this halloween party a few years back, and completely forgot about them until stumbling onto the box the other day.