I came up with this idea of a tooth fairy costume for my husband after we joked with our niece about him being the tooth fairy and wanting to pull her loose tooth.
I made the tutu out of tull, made teeth out of clay and attached them to his tiara and wand.
Related costumes:
Tooth Fairy Costume for a Sweet Girl 
Twisted Tooth and Tooth Fairy Couple Costume 
Coolest Tooth (with Crown) and Tooth Fairy Couple Costume 
Couple Costume Idea: Giant Tooth with a Crown and Tooth Fairy 
Terrifying Tooth Fairy Costume 
Scary Tooth Fairy Costume 
Scary DIY Tooth Fairy Costume 
Last-Minute, Scary and Not-So-Sweet Tooth Fairy Costume
LOL! My dad was something kinda like that last year. He was the hairy fairy! he didn’t shave and we gave him a blue bob wig and a tutu and then some of my old fairy wings. Then we put tinfoil around a wooden kitchen spoon and made a star on the top! We used an old tiara and it was hilarious!