Mad Men costume designer Janie Bryant told The Post how to be the next Don and Megan Draper — and it's not just about the bell bottoms.

See the '60s fashion trends that defined the era and that are still making waves today. ... Countess of Snowdon circa the late 1960s by opting into fashion's current penchant for motorsport-style ...

The full skirt of the '60s and hourglass silhouette led to girls everywhere belting their prom dresses in the late '60s and early '70s. ... major celeb fashion moments, and why wide-leg jeans are ...

Right now, the 2000s and '90s have the fashion industry in a proverbial chokehold. But the trends that are making rounds from two and three decades ago actually date back even further than that ...