Stuffing (polyfil, felt scraps, tissue, or newspaper)
Double sided fabric tape
Hot glue gun and sticks
For the dorsal fin:
Fold the hood flat along the seam. Lay a piece of orange felt underneath the hood with most of the felt sticking up above the hood. Use a fabric marker or chalk pencil to trace the hood curve and draw the fin waves on top. Cut two matching dorsal fin pieces from orange felt and hot glue the wavy edges together. Stuff with anything you have on hand - tissue, polyfil, extra felt scraps - and glue the remaining edge together. Cut a thin strip of black felt and glue along the wavy edge seam. Safety pin to the hood once dry.
For the eyes:
Cut two white circles, two smaller orange circles, two even smaller black circles, and two teeny tiny white circles. Glue the circles on top of each other toward one edge of each circle from largest to smallest. Use double sided fabric tape to attach eyes to the hood.
For the pectoral fins:
Cut two matching long D shapes from orange felt. Glue the curved edge together and stuff with any stuffing. Hot glue the remaining edge closed. Cut two C shaped black pieces of felt and glue to the curved edge of the fins. Safety pin to the sides of the belly under the arms once dry.
For the stripes:
Cut a long white felt strip and two thinner black strips that fit around the hood from side to side. If you don't have one long piece of felt, just glue shorter pieces together to get the length needed. Glue the black strips on either side of the white piece and attach to the hood with double sided fabric tape. Repeat the black and white stripe piece for the two belly pieces, making the white felt bigger and to fit across the belly and chest. Add lengths of blue along the black edge on both pieces. Fabric tape it to the hoodie.