The idea is deceptively simple: four walls containing a kind of anti- or quasi-pro shop of sorts. It’s smaller scale, independent brands, highly curated, available for only a limited time, and featuring everything from menswear to golf accessories neatly packaged in a crisp, sunny atmosphere. “The Pro Shop,” as it is cheekily named, features a thoughtful collection of designers and will run in tandem with the U.S. Open in Brookline, Mass., until June 20. The final wink? It’s located at The Street in Chestnut Hill, an open-air shopping district that is a quarter-mile from the gates of The Country Club, where the Open rages.