The many, many people who have applauded, criticized and otherwise taken part in what often seems like an endless discussion around Lizzo’s naked form may be surprised to learn that she does not spend quite as much time undressed as they may think.

“Sometimes when I look at the internet, I have an identity crisis because I’m, like, ‘Wait, who do these people think I am?’” Lizzo (birth name, Melissa Jefferson) said recently via Zoom from her home in Los Angeles. Behind her were many awards, an amethyst crystal for good vibes, and her Baby Yoda collection. “Right now I think people just think I’m naked all the time,” she said. “That’s the one thing I see: ‘Ooohhh, there’s old Lizzo, she’s naked again, I’m shocked she got on clothes.’”

Sure, she has posted some nudes online, using her own body to force a reassessment of prejudices around size and beauty. Sure, she has gone to events like Cardi B’s birthday in a sheer crystal dress over a thong and pasties and set off a viral debate.

But actually she has spent a good chunk of her time in the last three years not just on her upcoming album, or her new Amazon Prime reality show, “Watch Out for the Big Grrrls,” but also on an entirely different project. One that involves putting stuff on, rather than taking it off.

It is, she teased recently on social media, “the biggest thing yet. Bigger than anything I’ve ever done.” It may also be the most controversial.

Because Lizzo, champion of unfettered flesh, is making shapewear.

You know, the type of underwear that traditionally has seemed the opposite of the message about loving yourself as you are, contained in such Lizzo songs as “Juice” and “Truth Hurts.” Not to mention her TV show.

It’s the sort of potential contradiction that, in the social media echo chamber of personal sensitivities, can often end up viewed as a betrayal of the bond between fan and favorite. As Lizzo knows. Which is why she wants to be clear: She isn’t trying to change other people’s bodies. She’s trying to change the essence of shapewear itself.

The line is called Yitty, after her childhood nickname, and it was created with Fabletics Inc., the parent company of Fabletics, the “active life wear brand” co-founded by Kate Hudson. It will be introduced this week with about 100 different pieces divided into three collections: Nearly Naked, Mesh Me and Major Label.

Together, Lizzo said, they will “give everyone the opportunity to speak for themselves when it comes to how their body should look and how they should feel in their body.”

The point is to do for the concept of so-called innerwear what Lizzo did for size in general, not to mention the flute, which she famously plays while twerking — what she has done for herself, really: break it out of the box where society and culture has stuck it. Get past body positive, which has become a sort of meaningless catchphrase for the mainstream, to body normative for everyone.

“I’m selling that more than I’m selling thongs, more than I’m selling bodysuits or I’m selling shapewear,” Lizzo said. “I’m selling a mentality that ‘I can do what I want with my body, wear what I want and feel good while doing it.’” That whatever body you are showing off, it’s not, “‘Oh, how brave,’” she continued. “No. No more of that. Nothing to see here but a body, just like your body.”

A Brief History of Shapewear

“Shapewear” is a relatively new name for a very old concept (kind of like how “wellness” now encompasses “diet”) — that is, that a woman’s body should be altered via external means to make it more acceptable to the eyes of various beholders, most of them men. If that involved pain … well, such was the price of achieving society’s definition of beauty.

What forms the alterations take have varied according to cultural norms; references to girdles can be found as far back as the “Iliad.” Panniers, those underskirt structures that exaggerated hips, were a 16th-century version of shapewear; so were steel or whalebone and canvas corsets. Come the mid-20th century, elasticated girdles were in vogue, which in turn gave way to pantyhose, which evolved, in 2000, into Spanx, which is what made shapewear modern-day famous.

By swapping out cut-and-sew technology for Lycra knit, the Spanx founder Sara Blakely transformed Hollywood red carpets becoming a billionaire along the way.

Still, Spanx, like all the corsets and girdles before it, was a kind of “foundation garment,” made to be hidden, its very existence suggesting that what was underneath was somehow not quite up to par, even as it acted as a secret weapon to allow bodies of all types access to clothes made for the few. Also, “comfort,” when it comes to shapewear, remained a relative term.

In part to change that, lots of new players have entered the market, most notably, Yummie Tummie, founded in 2008 (and now rebranded as Yummie); Honeylove, created in 2016; and, above all, Skims, the Kim Kardashian brand, introduced in 2019, trumpeting comfort and a variety of skin color tones, and valued at $3.2 billion during a fund-raising round earlier this year.

Allied Market Research recently issued a report predicting the global compression and shapewear market would be worth $6.95 billion by 2030.

Though shapewear sales declined during the pandemic (who needs it when you are lounging around at home in your sweats?), Kristen Classi-Zummo, an apparel industry analyst for the NPD group, said that there has been an uptick in interest as Covid-19 protocols have relaxed and nightlife has returned.

Comfort remains important, she said, but growth was most apparent in “innovation, and pieces worn to shape and be seen,” especially among consumers under 40. Cora Harrington, the founder and editor in chief of The Lingerie Addict blog and the author of “In Intimate Detail: How to Choose, Wear, and Love Lingerie,” pointed out that for younger people, “Spanx tend to be more associated with their mothers. They want something more fashionable.”

“I think there is space for another brand to bubble up and control that narrative,” Ms. Harrington said. Perhaps because, despite all the advances in the sector, the overriding aesthetic has remained tied to the Barbification of the body.

That’s where Yitty comes in.

A Briefer History of Yitty

Though it may seem, in the wake of Fenty and Skims, that Lizzo, 33, is simply jumping on the celebrity shapewear bandwagon, she has actually been thinking about the sector since she was 12.

That, she said, was when she was growing up in Houston (her family had moved from Detroit when she was 10) and, starting in middle school, learning to be “ashamed of my body.” Later, once she had begun to assert herself musically, she rejected that mind-set, and the undergarments that came with it, entirely. And it was only after that, when she finally started to “have fun with my body, creating shapes and allowing my body to be curvaceous, loving the rolls that you’re supposed to hide, and exploring through fashion,” that she started to think about shapewear again.

“I went to a store — I won’t name the store — looking for something for a party,” she said. “And the shapewear aisle was in disarray, like someone went in there in a mad dash looking for something they couldn’t find. There were pieces on the floor, and there were only three colors — jet black, ivory white or pink, the color of my nails.”

Lizzo waved her hand, with its long, pointy nails the color of ballet shoes. “No one is that color!” she said. She got serious about changing that around the time of “Truth Hurts,” when she had a handful of meetings with different brands. “I was like: ‘Guys, I’m telling you, I’m trying to revolutionize shapewear and our relationship with it and with our bodies,’ and they were like, ‘Well, you could do a capsule collection with us for X, Y and Z,’ and I was like, ‘They’re not getting the vision!’”

She wanted shapewear that announced itself with pride — and felt like a hug. The kind of shapewear that if you sat down and your shirt rode up or your pants pulled down, you’d be happy to show off. The kind of shapewear you could wear with nothing on top. She didn’t even want to call it “shapewear.” She wanted to call it “bodywear,” but no one knew what that meant.

Then Kevin Beisler, her manager, told her he had met with the Fabletics team, who had been doing a lot of customer surveys.

Those customers had said that “the No. 1 category they wanted us to start was shapewear,” said Don Ressler, who founded Fabletics Inc., along with Adam Goldenberg. Mr. Ressler had seen what can happen when you combine celebrity power and a clothing sector in which the celebrity has some personal authority. (Fabletics was previously named TechStyle Fashion Group and had produced Savage X Fenty, which it spun off in 2019.)

“They get it,” Mr. Beisler told Lizzo.

“Those words alone were so incredible, because I hadn’t heard them,” she said. “Nobody had believed in my wild dream.”

Actually, Mr. Ressler said, “we think it’s a multibillion-dollar opportunity.”

The Lizzo Factor

Lizzo does not think the market is saturated or that she missed the boat because there are other brands ahead of her. “There’s nothing like feeling like you’re in the right place at the right time,” she said.

Yitty is “something personal to me, something for the baby version of me,” she continued. “I have been parallel with the body positive movement for a long time, and people have made my name synonymous with it, and I’m always like, body positivity belonged to the people who truly created it, the Black, brown, queer big women, my girls in the 16 plus.” As an indicator of intended audience, the ad campaign features models of all sizes, including Lizzo’s best friend, who is an extra-small, as well as Lizzo herself.

Lizzo is the chief executive and co-founder of Yitty; Kristen Dykstra, the former chief marketing officer of Fabletics, is president. The lines took three years to develop and will range from XS to 6X (which is one size bigger than any of Skims’ current offerings). Prices for leggings are $69.95 to $74.95, and bras will be $49.95 to $59.95.

There are two compression weights, antimicrobial fabrics so the shorts and thongs and leggings can be worn without extra underwear, bras that hold their shape without underwire, a print that looks like a butterfly wing, and recycled packaging. Lizzo named all the colors, though her favorite inventions — for a bright blue and a bright pink — are unprintable here.

She also tried everything on. “I love a cheeky panty, I really do,” she said. “It can be tricky when you’re using compression fabric because if it’s too cheeky, it can roll up.” But, she said, many times “I’d put a panty on and say. ‘Can you slide the side up this way?’” — she mimed raising the cut of the leg — “because it makes the booty look good.”

She has very strong opinions about what she likes. “I could not take off the Yitty convertible bandeau for a long time,” she said. “I’m a bandeau innovator.” As for the shaping thong: “I’m like: ‘Hello, big girls wear thongs. Let us wear thongs and give me that little love up top.’”

Yitty will be sold on its own website and on the Fabletics website. It will also be sold in shop-in-shops in the 76 Fabletics stores and have its own pop-up in Los Angeles on April 12. And it will be front and center at Lizzo tours and in her videos and TV shows. As far as she’s concerned, it’s the beginning of her next stage.

“I want to be a world changer,” she said. “I wasn’t just making cool music — my art always had a bigger purpose. Now I’m just taking that usefulness and making it tangible.”

“This is something I’m building that can hopefully last for generations — not just the company or the product, but the mentality of Yitty,” she continued. “This idea of liberation with your body and being able to express it in different ways can go so, so far.”