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Workout clothes aren't just for the gym anymore.
The new crop of sexy, form-fitting and fashion-forward fitness apparel has women wearing their gym clothes to the grocery store, out with friends, and even to the office.
(Even though some people disagree.)
"It's not just a trend, but a cultural shift in the way women are dressing, and how they're approaching their work style," Caroline Gogolak, co-founder of Carbon38, a website for luxury activewear, told TODAY.com. "People realize they need to be able to perform throughout their every day life, and maybe that doesn't mean pounding it out on the treadmill. But there's a reason that Lululemon leggings created such a market. Women realized they wanted to wear this legging to more than just the gym, because it's comfortable, it's machine-washable, it looks nice and it's presentable."
As companies start to shift toward more relaxed environments, adopting policies like flexible vacation days and the freedom to work remotely, it makes sense that there's room for a more casual wardrobe. Add in the recent wave of designer fitness apparel lines, and it's no wonder women are wearing their yoga pants from breakfast until bedtime.
It also aligns with the recent push toward healthy lifestyles: "There's been a big shift from personal luxury to personal fitness," Katie Johnson, Gogolak's partner in Carbon38, told TODAY.com. "The way that five or 10 years ago we were saving up to buy a handbag, now we're saving up to buy a meal-delivery plan or personal-training sessions."
Or, a wardrobe of fancy yoga pants. Many women told TODAY.com that basic black yoga pants make for a perfect work outfit.
"If I know I'm going to the gym at lunch, I'll put on black leggings, a black tank top and some type of sweater or top over it," Erica Harriss, a 38-year-old entrepreneur who lives outside of St. Louis, told TODAY.com. "And I just amp up my jewelry a little more."
Christine Pierson, a PR associate for Birchbox, told TODAY.com her office is always filled with women in workout clothes — and not just black yoga pants.
"Sometimes you'll see girls with a full Lululemon outfit; they'll be wearing the top and the workout pants," she said. "Or they'll wear workout pants with a sweater and a leather jacket and nice sneakers. People definitely look presentable. They're not showing up in scrubs."
Plus, the outfits motivate Pierson and her colleagues to exercise after work, she added.
Sales prove women are investing in their workout wardrobes. As shoppers swap jeans for yoga pants, denim sales are down and athleisure sales continue to rise. Americans spent $323 billion on apparel in 2014, a 1 percent increase from the prior year that's largely due to athletic-related purchases, according to The NPD Group, a market research firm.
Some brands are even creating clothes with the specific intention to transition between work and workouts. Apparel brand Tanya-B was created when two New York City yoga instructors realized they were sick of lugging around multiple outfits, to change in between teaching classes.
"There was too much changing and going back and forth from the yoga room to drinks or errands or whatever else outside," co-founder Tanya Boulton said. She also wanted to make clothes that are just as fun and sexy as they are functional. One of the brand's most popular pieces, a tie-dye halter, passes as a cute top.
Ready to try it? Here's how to pull off gym clothes at the office:
1. Pick the right black pant
"Start with a great set of leggings," Johnson said. "You want something that's not terribly branded."
Fabrics matter, too. Choose something with a "soft sheen," she added, which looks dressier.
2. Embrace layers
Many women told TODAY.com their go-to fall outfit is black leggings and a long top or sweater, paired with boots and a leather jacket. Use the black yoga pants as a base, and add layers from there.
3. Play up accessories
If your goal is to wear yoga pants but still look like you're wearing regular clothes, consider jewelry your new best friend.
"I'll put on pearl earrings or a big necklace," Harriss said of how she dresses up a leggings look.
Legwarmers peeking out of boots is a warm way to add dimension to otherwise simple yoga pants. (Plus: Legwarmers are fun!)
4. Or, go all out
If you're ready to try a full-on fitness look at work (and your job allows it!), the trick is to make sure every component of your outfit is sharp, including footwear. Wear sleek sneakers, never dirty running shoes.
This story originally appeared on Oct. 26, 2015.