There are cute pink fleece hats for girls and dolls at our local Borders. I don't know if other book stores are offering this set too. You get the girl and doll hat for like $11. The hats were on the same display as the contest to win the MY AG doll.
I picked this up at Books-a-Million, they also have them at Barnes and Noble too. I'm not really sure if you can buy them at American Girl stores or not.
Onto the review: It comes with two pink taboggans with American Girl written across the bottom. It costs $10.95. The taboggan fits really well and looks good with lots of outfits. I was surprised that the "girl" sized taboggan fit me since I wear an adult XXL motorcycle helmet. hmm.. I give this an A+. I think it is worth the $10.95 for a girl and doll hat.
I got these too. I wanted to add that the "American Girl" embroidered in red on the girls' cap is small doesn't have much contrast on the pink fleece; you can barely see it from a few feet away. It's not babyish either, just plain - so an older girl could probably wear it without getting any funny looks.