Vinted users have been reacting angrily following a change that caused items being listed as the wrong size.
The second-hand shopping app has revised its sizing categories for women's and children's garments without notifying all shoppers about the modification.
Numerous buyers and vendors are expressing on platforms saying Vinted listings now show an altered size classification versus the original listing because of the remapping.
Vinted explained the updated approach better aligns with similar services.
It has advised users to review their products and adjust the sizing manually if necessary, causing user dissatisfaction.
Previously, the sizes had both a single numeric size and a letter, like S/8 or M/10.
The updated approach includes an alphabetical indicator and numerical range such as S/UK 8-10.
With some products, the size labels have been reassigned - for example a size L used to be a 12 but is now a UK 16-18.
Frankie Bridger, who produces content about larger sizing, explained the modification "makes transactions more difficult".
"Not many brands say XL is a 20-22," the way the service now categorizes.
Stephanie Gallen, from Glasgow, said garments she listed featuring size 14 markings were displaying on the service as measurements 20-22.
"Should someone sized 20-22 purchase these they're going to be very disappointed," she stated.
A different user, located in England, stated she felt frustrated due to the update requiring manual adjustment the sizes on "every single listing".
"Personally, this is quite irritating, as I'm chronically ill and selling on Vinted has been paramount following partial earnings loss," she stated.
The service features exceeding 100 million users, comprising 18 million UK members.
It has emerged as a preferred choice compared to resale services such as eBay and Depop.
This isn't the first time that an unexpected update to the app has proved unpopular: previously, the platform withdrew an update concerning shipment methods due to shopper criticism.
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