Measure and cut a rectangle of green fabric that, when folded in half "hamburger style" will reach from your baby's neck to hip. While the fabric is folded in half, cut a small half circle into the fold of the fabric for the head opening and keep cutting as needed (remember, you can always cut more if needed, but you can't undo a cut that's already done!) Cut a vertical line down the front of the opening to create the "collar" look of the tunic.
Cut a long strip of brown felt and tie around the waist for a belt.
Cut two small thin strips of brown felt and hot glue to the front of the tunic in an "X" shape.
Cut a zig zag around the sleeve edges and bottom edges of the tunic.
For the hat:
Cut two matching half circles with a point on one side from green felt (this should somewhat resemble a shark fin.) Hot glue the top of the hat edges together. Cut long triangular flaps for the folded up brim and hot glue around the bottom edge of the hat. Cut a red feather from felt and glue to one side of the hat, or you can buy a red feather at any craft store to add.