A look from the new 3.1 Phillip Lim Initials loungewear collection. Photo: Courtesy of Phillip Lim

With the Beyoncés, Gagas, and Rihannas of the world donning their panties in public and Phillip Lim launching a new so-pretty-you-could-wear-it-outside loungewear collection, it doesn't look like the underwear-as-outerwear trend is going out of style anytime soon.

Lim's year-old intimates line, dubbed 3.1 Phillip Lim Initials, will expand to include loungewear this fall, with some pieces sharing the prints and appliqué techniques seen in his ready-to-wear apparel, according to WWD.

The new range of what Lim is calling "underpinnings" includes a cropped kimono he refers to as a "kimini" in washed-out watercolor florals, harem pants, slouchy V-neck tees, ruffled camis and boy shorts, as well as knitwear pieces like cardigans and cropped sweatshirts.

"You could wear this out walking around the city or to stay in. It's all about clothing that is versatile and adaptable," Lim tells the paper.

"The idea is about a staycation," he says, before explaining that his description of the collection recalls "the initial thing you put on."

Another look from Phillip Lim's new loungewear collection. Photo: Courtesy of Phillip Lim

"When people think of intimates, it's unmentionables, things that you hide," he says.

"For me, this collection is just the literal translation: the pinnings that go underneath. You can wear it in or layer it to go out."

Are you brave enough to wear your "underpinnings" outdoors? Let us know in a comment.

Meanwhile, read why lingerie sales are up among middle-aged women in the U.K.