DIY Tooth Fairy Halloween Costume Ideas
A great thing about tooth fairies is that they really don't have a fixed look. If you don't find something you like you can always improvise and make your own costume. You can choose to make it scary or nice, it's all up to you. Don't forget to add some kind of bag to your costume for collecting teeth.
Here are some links that have a couple of nice ideas: DIY Costumes for kids, DIY costumes for adults.
And this pillow can be used on your DIY costume if you like to paste or sew this cute tooth on your homemade tooth fairy costume.