A boy who had been homeschooled his whole life into public school unexpectedly and had to get used to a new way of life this sentence is most likely an example of a

Change vs. tradition

Explanation: Change versus tradition is a literary theme that consists of the character having to radically change something in their lives and learn to adapt to it. A boy who had been homeschooled his whole life into public school unexpectedly and had to get used to a new way of life is an example of a tradition being broken, and a change for the kid in this new reality.

i guess you are missing the idea that has to be supported, am i right?

i believe it is the bright red satin shirt.