Carson was just SO proud of himself for being dressed like this! And he wore it to school. If it makes him so happy and doesn’t hurt anyone else, I say, go for it! He came home happy, and excited that his teacher liked the yellow stripes he made out of paper for his vest. 
He's probably going to look back at his pictures and just assume that you were the one that dressed him so. I love it. And I say, go for it too. No one else cares, in fact most people think it's cute!