The flannel nightgown I made for my niece and her American Girl doll for Christmas were a huge hit. She wants to wear it every night even though she lives in a warm and humid climate. So she and her doll needed some matching cotton shorts. They were fast and easy to sew. I'll be able to whip out a few more sets once I find out how they fit.
I also made a t-shirt for the doll since so many outfits require one. It was not as easy; sewing jersey knit is hard!