Earlier this summer, when Ben Affleck and Jennifer Lopez hit the Little White Wedding Chapel in Las Vegas, the actor and director broke out a white dinner jacket (from his closet, per Lopez’s newsletter) for the festivities. This weekend, when they celebrated their union with a larger ceremony, Affleck went back to his trusty formalwear formula. This time, though, he dialed up a new look from Ralph Lauren: a tuxedo consisting of a single-button cream dinner jacket with peak lapels, black bow tie, white piqué bib shirt, black double-pleated pants, and black patent shoes.

There are no hard and fast rules for a wedding outfit. But you’re never going to be unhappy if you go classic and timeless—eternal, like your commitment. And it’s hard to get more timeless than a white dinner jacket with pleated trousers and patent-leather shoes. (Bonus points for matching your bride, as Ben Affleck did: Lopez wore a series of dresses from Ralph Lauren.) The lesson? Great style, like a great love, never goes out of fashion.