Here’s what consumers have asked with answers from Uniqlo staff and previous consumers.
Legit company that behaves like scam artists-see review about returning Airism camisoles, for item they themselves called defective, wouldn't refund return shipping until requested 5 separate times, even after agreeing to do so, and still fighting me about refunding original shipping charges
Extremely hard — your can reach them by chat and they refuse to call you when you ask them to (they say they cannot do it, which seems dubious to say the least)— really not a helpful customer service.