I found these adorable mini hats at my local dollar store. They come in packs of three for a buck, and they work well for 18 inch dolls or minis. the dollar store is a great place for doll sized Halloween finds.
The hats have a solid piece of felt on the bottom and are attached to an alligator clip. They look cute on any size head, so all your dolls and girls can match each other. I can't wait for Dolloween!