AG Doll Fan shares a couple of free patterns on her blog, Arts and Crafts for your American Girl Doll, for making a set of hospital scrubs for an 18″ doll. Use a solid blue broadcloth to make them look like real scrubs. Or, change out the fabrics and make a whole wardrobe of (non scrub) pants and top for the doll. Go to Arts and Crafts for your American Girl Doll for the scrub pants pattern and the scrub top pattern.
[photo from AG Doll Fan]