You will need: 

Waders or just a pair of knee high rubber boots
Jeans and a shirt
Fishing hat
Sun glasses (could be place on the hat not on the eyes)

Instructions

A.  Dress your child in the jeans, shirt, and waders. 

B.  Put on his fishing hat and hook the sunglasses to it if it will be dark.

C. (optional) attach paper fish or fish stickers to his clothes