Sweatpants, both slim and slouchy alike, have become a real wardrobe essential . Here's how they got there: Champion started it all, sportswear powerhouses like Adidas and Nike made them cool, Jean Paul Gaultier brought them to the runway, and now almost every brand offers a some sort of style that doubles as both lounge and streetwear . Many people would want to use them as formalwear, but we won't go that far. Still, a pair of sweatpants is a good off-duty look these days. The best pairs fit just as well as your favorite trousers or jeans . Much like the hoodie , sweatpants have surpassed their sport and streetwear origins, becoming a menswear go-to.

From tried-and-true cotton classics to updated takes on the style from some of the coolest labels, including Mack

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