Genius idea for an elf Halloween costume! All you need from your local Goodwill is a stripped T-shirt, matching pants, a belt, and shoes! You might even already have some of these at your house! All you need to do is make the hat!
Homemade Costumes that Really Won Prizes in Local DIY Halloween Costume Contests! The Queen of Hearts should be Alice instead though. In back story Alice and the Hatter were in love. It is only ever actually stated in one version of the movie.