What are the first intimations that Piggy is a rather lower class person? How does he tell us by speech movement and social action with Ralph?

Piggy is "different" from the other boys because he has asthma and therefore cannot participate in every activity they can. He also wears very thick glasses which makes him the "butt" of some jokes. However, he is a good lieutenant for Ralph and he clings to Ralph to give him advice and find safety since Jack's group would not accept him.