Read the following context and answer the question.
Context: He said he 's just going to wear something he already has . Sounds good to me ! They are n't trick ' r treating , but are still dressing up . A bunch of kids are going to decorate the front and have fun passing out candy .
Question: What may be the reason why they are happy he will wear something he already has ?
Answer:


They do n't have to buy a costume .