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The classic American wardrobe may be different than before — and a lot harder to pin down, too.

There's a reason the athleisure trend has exploded in popularity: people want convenience and comfort with style, and sporty fashion is the answer.

Once confined to gyms and studios, yoga pants are now widely accepted attire in many social settings, from the office to the classroom. And this rise in yoga pants as everyday clothing is contributing to a decline in the price of cotton.