What you need:
Needles- size 10
2 colors of 4 ply yarn
Start by casting on 21 stitches in one colors knit for 5 rows change yarn to second color. Knit for 3 rows,Â cast off.
Cut elastic to desired length.Â Sew on to headband, put on your doll and have fun.
P.S You can enlarge it for a little girl.Â For Megan, I used 40 stitches.