Mesure your MP3 player, On some paper mark out two rectangles 3 centermeters bigger then your MP3 player.
On the second Rectangel mark out 1 centermeter above the top and 4 centermeters Diagonaly, do the same on the other side and cut out. This will be the front
Mark around the patterns on dark brown felt, cut them out and pin them together. Remember to leave any pencil marks on the outside for now as this will become the inside later.
Sew together, You can use either a sewing machine or do it by hand, and then flip inside out.
Cut out Red felt in a rectangle if you are unsure about how big or small to make it cut the rectangle out in paper first.
Cut out maching zig zag strips for the teeth and using craft glue stick the teeth on the top and bottom of the red rectangle. allow to set and then sew or glue the mouth in place.
Glue on the googlie eyes (you can use buttons or black felt instead)
Attach velcro to the back flap and your cosy is ready to go.