You can use any cloth and a little fiberfill.

Patterns are here. Arrange the form as you like.

Process

Example : Chaetodon octofasciatus. 6cm.

It means 'eight stripes'. But why only six?

• Sew 2 pieces of cloth at the mouth.
• Turn inside out.
• Stuff a little fiberfill.
  Glue the fins.
• After the glue dries, cut the fins zigzag.

• Glue the felt eyes.
• Draw the stripes with a felt-tip pen.
  If you like, attach the pectoral fin.