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TORONTO – Trendy yoga gear maker Lululemon Athletica Inc. is suing Calvin Klein Inc. for patent infringement, accusing the designer of copying a waistband used on its popular body-hugging pants.

TORONTO – Trendy yoga gear maker Lululemon Athletica Inc.’s signature body-hugging pants have become so integral to the popularity of the brand that it is suing Calvin Klein Inc. for patent ...

Lululemon Athletica Inc., which built its brand on bum-hugging yoga wear, wants other manufacturers to keep their hands off its pants. The Vancouver-based retailer announced on Tuesday that it has ...