Vinted users have been reacting angrily following a change that caused items being listed as the wrong size.
The second-hand shopping app has altered its measurement guidelines for female and kids' apparel failing to inform all shoppers about the modification.
Countless users and merchants have taken to social media stating that platform listings now display an altered size classification versus the original listing due to the recalibration.
The company said the updated approach better aligns with similar services.
The platform has recommended to review their products and adjust the sizing manually when needed, causing user dissatisfaction.
Previously, the sizes had both a single numeric size and a letter, for instance S/8 or M/10.
The new system has a letter and a range for example S/UK 8-10.
In some cases, the sizing has been recategorised - for example a size L was formerly size 12 but now shows as UK 16-18.
One content creator, who makes TikTok content about plus-size fashion, said the change "makes both selling and buying harder".
"Few clothing companies classify XL as 20-22," as the platform currently indicates.
A different member, from Glasgow, said garments she listed featuring size 14 markings were showing in the marketplace as size 20β22.
"Should someone sized 20-22 purchase these they may become frustrated," she stated.
A different user, based in Derby, explained she became annoyed because the modification necessitated personal updates the sizing for "all her products".
"For me this is particularly frustrating, since I have chronic health issues and platform income has been essential following partial earnings loss," she explained.
The app has more than 100 million shoppers, including 18 million in the UK.
It has emerged as a preferred choice versus similar marketplaces including eBay and Depop.
This represents another occasion that an unexpected update within the service has received backlash: previously, the platform withdrew an update regarding delivery choices following member complaints.
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