Halloween // Hi everyone! In need of costume ideas that match to a witch!

So as the title says, me and my girlfriend are planning on matching costumes this year and she's chosen a witch. It's completely lost on me on what could potentially pair as a couples costume. I made the funny joke on "I'll tape a broom on me cause you know a witch rides a broom ha ha" but obviously don't want it to be a lazy costume. So any input will be greatly appreciated! Thank you everyone!