My co-worker's daughter cleaned out her closet and when she does that I get to go "shopping". :) One of the shirts she was getting rid of was a Snoopy fitted shirt. I have swimmer/gymnast shoulders, so I couldn't wear it, but I knew Bean would love it. Sure enough when I brought it home she said "Oh Mommy! A Snoopy shirt for Ella Bean!" So I went about converting the shirt to a dress for my Bean.
I cut off the sleeves and narrowed the body a wee bit. (I used my serger for the narrowing.) Then I sewed elastic in the neck and arms. I pulled the elastic as I went and zig zag stitched.
And that is all there is to it! :) Bean loves her Snoppy dress. :)