Gym Clothes Cool Enough to Wear Everywhere

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One glimpse at the spring Stella McCartney for Adidas collection will make you want to wear gym clothes all day long.

Frumpy sweatpants and ugly sports bras? They're gone. These days, it's hard to tell if women are on their way to the gym, or following the hottest fashion trend. Leggings and hoodies have been wardrobe staples for the past decade, and the recent onslaught of fancy sweatpants, high-end sneakers, and kitchy sweatshirts pumped even more activewear into retailers. And now there's a '90s-inspired athletic vibe on the runways, with designers incorporating hi-tech fabrics like mesh and neoprene into their clothing collections. Put this all together, and the line between sportswear and everyday clothes is severely blurred.

According to trade paper Business of Fashion, the sale of women's activewear reached $11.5 billion in 2013, up nine percent from the previous year, but brands like Lululemon aren't the only ones shilling workout gear by the truckload. The Stella McCartney for Adidas collaboration launched in 2004, and has grown into a worldwide success story over the past decade. Forever21 launched a line of sportswear in 2010, Gap opened their Athleta stores in 2011, Theory add a line of exercise clothes in 2013, and H&M launched H&M Sport this year with input from the Swedish Olympic team. With so many cool and comfortable athletic attire options, we may never wear real clothes again. Check out the latest offerings-you'll never know they're gym clothes. By Joanna Douglas, Yahoo Shine Senior Fashion and Beauty Editor