Anatomy of a polo shirt Fit: Big, billowy polos are out. Manufacturers now favor a sleeker fit through the chest, waist and shoulders. Careful: With modern looks, you may have to go one size up.

To help newbies and polo-shirt fans alike nail the look we turned to a few of our favorite menswear stylists for their thoughts on how the staple should fit and feel. Here's what they had to say.

Equip yourself with a classic Lacoste polo shirt—or venture into less-charted territory—with this guide to the tennis shirt’s natty descendants By Jacob Gallagher April 22, 2015 2:20 pm ET Share ...

Sharper than the typical off-the-shelf polo you’ll find at a retail store, a duty polo offers many of the same functions of a uniform shirt but in a relaxed yet professional fit that lets you ...

So too did the straining white T-shirt that was purpose-built to choke it. But for all the Herculean workouts, and for all the gains gains gains, the muscle fit was never particularly flattering.

Gucci web-collar polo shirt, $680, buy now at Matches Fashion Topman muscle-fit knitted polo, $18 (was $50), buy now at Topman Orlebar Brown "Horton" knitted polo, $295, buy now at Orlebar Brown ...