Easy how-to ideas for kids costumes (would work for adults too) - the shark seems cute, easy and comfy.
Shark Costume - Kids Costumes
For P's costume, I am going to do it all feltwork on the hood itself. No dangling teeth. Just cut the triangles and attach to the red strip. Then attach the piece as one along the edge on the hood. No fin to bother him either. Pair with jersey sweats. Halloween our way for P :)