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 T shirt Refashion Ideas with white lace sleeves. Five interesting ideas how to refashion your old t shirt and diy new fancy t shirt white lace sleeves. Not strictly lotr/hobbit, but could work for an inspired outfit