from makers like Zegna, Burberry, and Hickey Freeman, and casual things from Polo and Paul & Shark. Finicky big guys can special-order suits in any size and fabric.

That’s the strategy behind Destination XL Group’s (DXL) latest move. The big and tall men’s clothing retailer, which operates 300 U.S. stores, an e-commerce site, and a mobile app, has partnered with ...