I've ordered from Garnet Hill occasionally over the past several years, my favorite thing being their kids' flannel pajamas. They are currently on promo for $34. (regularly $44.) and I just placed my order for three pairs of super cute Christmas jammies (shhh... this is the one present they get to open early on Christmas Eve... though they may have caught on by now...). So Christmas morning, my three will be sporting the happy green Holiday Sheep version:
pic from garnethill.com
These are made of German cotton flannel and modacrylic, which Garnet Hill explains is inherently flame-resistant. I avoid buying jammies with flame retardant chemicals and usually opt for snug fitting ones or Hannas. While trying to figure out exactly what this modacrylic is, I came across this, where the author discusses flame retardants and mentions Garnet Hill's flannel pajamas.
The promo lasts through December 7th, while supplies last.