Answer:
by offering information about Wash’s hopes for the future
Explanation:
Wash, as he sometimes gets to ride in other peoples' cars, sees that there are towns that are better and fancier than the one that he lives in. He hopes that in the future he will be able to live in one of these towns or the houses in them that are better than his own, and this gives us a personal connection to what he's feeling.
The significance is that it is not really a costume, he has the actions of being a fool.
