Sleeveless Stripe Front with Bow. Use old white t-shirt to make the "sleeve" part on the girl scout shirt. That will allow a wider sleeve area and a bow. Just match it with an earlier post on my sewing board.
DIY Tee to Cut Out Bandeau Top Tutorial from Bleached Faded here. Really easy tutorial although Id probably sew wear she has used fabric glue. I would also again wear a tank top or something under it so it's more modest.