Founded 70 years ago when twin brothers Arthur and Henry D’Angelo began selling pennants from a street cart by Fenway Park, this homegrown brand now has a flagship store on Newbury Street and licensing deals with the four major pro sports leagues and nearly a thousand colleges. Root for the home team without saying a word in Clean Up ballcaps that scream Bs, Celts, Sox and Pats in thick 3-D embroidery, or opt for low-key logos on Scrum tees and High Point jackets. And keep an eye out for special projects like the new Carhartt collaboration that kicked off the Sox season with beanies, caps, tees and hoodies.