is the new...

(something) is the new (something)

Something has replaced something else as the most fashionable, trendy thing of the moment. In the office of this young billionaire, jeans and a T-shirt are the new business casual. Trust me, navy is the new black when it comes to winter jackets.
See also: new
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

... is the new ...

(British English, informal) used to say that something has become very fashionable and can be thought of as replacing something else: Brown is the new black.Comedy is the new rock and roll.Fifty is the new forty.
Farlex Partner Idioms Dictionary © Farlex 2017
See also: