The black body-con dress, which currently retails at £15, sold out quickly after model Lottie Moss was seen wearing the outfit in London.
The dress includes ear straps at the top of its roll-neck, meaning the fabric can be pulled up and secured over the nose and mouth.
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A spokeswoman for PLT told the PA news agency: “This has now been restocked so is still available in some sizes.”
The dress was originally available in UK sizes 4-16, however the range is now limited due to demand.