Today we decorated t-shirts for our American Girl dolls. Lucy and Julia can sew skirts for their dolls, but shirts are too challenging right now. I spent some time searching online for doll shirts, and finally decided to try Gerber newborn size onesies. It worked! (Actually, Carter's preemie size works better but they are harder to find.)
I simply cut the bottom off the onesies and then let the girls decorate them with fabric markers.
Esther made a onesie for her Bitty Baby, but it ended up being too long on her. (We have some Carter's preemie clothes and they are long as well, but better.)
I'm already thinking up more ways we can decorate shirts: matching 4th of July shirts, matching Christmas shirts, sew something on the shirt, paint on the shirt, etc.
We'd love to hear what ideas you come up with!