The website Shein is known for selling ultra-cheap clothes that could be classified as "designer knockoffs." But faced with a knockoff of itself, the Singapore-based online retailer is calling in the lawyers.

Shein says its Chinese rival, Temu, is not just copying it but is violating its copyrights. Temu, for its part, is suing Shein for violating American antitrust laws and monopolizing the niche market for "ultra fast fashion."

Bloomberg Law reporter Katie Arcieri joins us on our weekly podcast, On The Merits, to explain what ultra fast fashion really is, and why these two Asian companies are hauling each other to court in the U.S.

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