Upper East Side yuppies will be itching to pile on classic American garb at brothers Jay and Kevin McLaughlin’s sportswear shop. Since 1978, the McLaughlins have been supplying lads with crisp work wear and boatside-worthy basics. Corduroy curtains, plaid red carpets and oak cabinets give the atmosphere a gentlemen’s-club vibe. While the threads aren’t cheap, you’re paying for quality basics, such as long-sleeved rugby shirts ($128), quilted button-down jackets ($245), solid V-neck sweaters ($125) and checkered button-down shirts ($105).