SuperBree!
This costume is so easy, a six year old could make it (and did).
All this one requires is a snazzy pair of jammies, a solid colour towel or receiving blanket, and a ribbon.
Add some boots, and you're good to go.
I suppose if you really wanted to get fancy, you could go to the Dollar Store for an eyemask. Or, you could break out the construction paper and the string.
Comments and faves