Answer:
The pun in the sentence is based on the word camouflage. It is a pun because Shelly cannot find the shirt because it is designed to be hidden high and low.
Explanation:
A pun is a joke exploiting different meanings of the same word. She is looking for her shirt that has a camoflauge pattern, but she cannot find it because it is camoflauged. It blends into other things. Camoflauge is functioning both as the pattern and has a verb.
