With winter on the way, ‘tis the season to bundle up in flannel.

But leave it to Rihanna to try something a little cheekier that your typical tartan: flannel pajama bottoms with a butt cleavage cutout.

The 33-year-old lingerie mogul modeled her new Savage X Fenty flannel designs on Instagram Stories over the weekend, first posing in the Tied Up Tartan Sleep Short ($44.95), PJ Raw Hem Sleep Shirt ($64.95) and Bralette ($32.95) before slipping into – last butt not least – the Tied Up Tartan Open-Back PJ Pant ($49.95).

While the latter design appears to be your standard plaid pant from the front, a turn to the side reveals the style’s titular open back and an adjustable tie, designed to “show off what you want, Savage style,” per the product description.

A selfie of Rihanna in a plaid bra
The star also modeled other matching pieces from Savage X Fenty’s flannel range. badgalriri/Instagram

Some Twitter users were confused by the cutout, with one writing, “love rihanna but really who is wearing assless flannel pjs,” while another added, I think I’m officially old because these PJ pants from @rihanna’s line have me shaking my head and saying, ‘Kids these days…’”

Others were less skeptical of the style; one Twitter user praised the plaid pants, writing, “Rihanna finally made a sleep set with the booty cut out so we don’t have to walk around in ole’time flannel onesies.”

“[Rihanna] made a billion dollar commercial empire turning out stuff like assless flannel pajama sets and I gotta say I respect the hell out of it,” a fourth tweeted of the derrière-baring designs.

Rihanna modeling blue plaid pjs with a butt cutout
Rihanna modeled the cheeky design on Instagram Stories. badgalriri/Instagram

It’s hardly the first time the pop star has put a cheeky spin on an otherwise everyday ensemble. In June, she divided fans with the release of different bottom-baring bottoms: Savage X Fenty’s Soft Mesh Open-Back Crotchless Leggings ($49.95), which, despite looking like workout leggings from the front, feature a similar surprise cutout.

In February, Savage X Fenty reached a $1 billion valuation, months before Rihanna herself became a billionaire in August, according to Forbes.

Now that’s quite the bottom line.