The closet doors opened in a major way this year with the launch of 11 Honore, a high-end online retailer for lusted-after brands and exclusively made clothes in a size range of 10 to 20. That’s far closer to the national size average for women than the size options other high-end retailers generally offer.

So far, 11 Honore is selling women’s selections for luxury shoppers at prices akin to what the typical Net-a-Porter or Barneys New York shopper might expect.

Fashion world veterans Patrick Herning (an alum of public-relations powerhouse HL Group) and Kathryn Retzer (a former Vogue editor) are the masterminds behind the retail startup, which launched in August and operates out of West Hollywood.

So what’s the keyword in their mission to bring more high-end fashion to more women? It’s not so much about size as it is about fit. “We came to major design houses with the pitch that we could work together to produce their exact designs, in the highest quality possible, with the same perfect fit on a size 18 as they offer in size 4,” Retzer said.

Across the board, designers appear to be rejoicing in the approach. After all, consider this training wheels for luxury brands eager to race into the $200 million plus-size fashion business.

By now, it’s an oft-cited statistic that 67 percent of women in America are a size 14 or larger. Now consider her options for luxury fashion. A handful of bricks-and-mortar stores, Saks Fifth Avenue being one, offer a fair assortment. Then turn to the offerings of major online retailers, which sell dozens and dozens of luxury clothing brands. A recent check of a well-known luxury retail site showed the number of options easily shrunk to seven when you filtered to XXL.

“Women with curves are often treated like second-class citizens at department stores,” said Melissa Chataigne, an L.A.-based fashion stylist and consultant. “My clients aren’t going to be satisfied by a sad selection of cable-knit sweaters and stretch pants — and they’re not going to be happy buying a Celine bag and Jimmy Choos because they can’t fit into anything else.”

11 Honore, with its name that invokes the image of a bougainvillea-draped, side-street Paris atelier, certainly set out for a different approach. “We’re about celebrating women’s bodies, not hiding them,” Retzer said.

It’s a thought that’s clear when you browse the online fashion showcase created by Herning and Retzer. You’ll find sheer shoulders, velvet ruching, alluring cut-outs and nipped waists. Also, the modest options offer a twist. A long hemline, long-sleeve dress by designer Prabal Gurung has a subtle peek-a-boo moment with decorative buttons.

This approach to size-inclusive fashion appears to be resonating with customers. Rebel Wilson wore 11 Honore’s bright red Zac Posen dress to the Australian premiere of her film “Pitch Perfect 3,” while Nicolette Mason, a plus-size fashion industry leader, showed up on Instagram in a wool Michael Kors dress from 11 Honore.

To continue to promote the retailer’s mission, 11 Honore’s blog, Page 11, features stories about models, designers, industry leaders and stylists who are changing fashion as well as shopping tips and other lifestyle content. Also, the startup’s Instagram account offers photos of 11 Honore looks worn by “Orange Is the New Black’s” Danielle Brooks, model Candice Huffine and others.

“I hope we’ll get to look back at this in three years and ask ourselves what the big deal was,” Herning said. “The world is evolving, and we’re excited to lead this piece of the conversation.”