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Members of the platform have expressed outrage following a change that caused products showing incorrect sizing.
The popular resale platform has updated its size classifications for female and kids' apparel but did not contact every member regarding the update.
Many shoppers and sellers have taken to social media saying Vinted listings now show a modified sizing category than originally posted because of the remapping.
The platform stated the revised method more closely matches other platforms.
They have suggested members to review their products and adjust the sizing manually when needed, causing user dissatisfaction.
Previously, the sizes had both one number and one letter, like S/8 or M/10.
The updated approach includes a letter and a range like S/UK 8-10.
With some products, the sizing has been recategorised - such as a large size was previously a 12 but now shows as UK 16-18.
A fashion influencer, who produces content about larger sizing, explained the modification "makes transactions more difficult".
"Few clothing companies classify XL as 20-22," the way the service now categorizes.
Another user, located in Scotland, stated items she posted with size 14 tags were appearing on the platform as size 20–22.
"If anyone [who is] size 20-22 buys them they're going to be very disappointed," she explained.
A different user, from Derby, explained she became annoyed by the change as she had to manually change the measurements for "each individual item".
"This situation is especially annoying, because of my ongoing medical condition and selling on Vinted has been paramount after experiencing income reduction," she stated.
The service features exceeding 100 million shoppers, comprising 18 million UK members.
It has emerged as a preferred choice compared to resale services such as eBay and Depop.
This represents another occasion where an unanticipated change to the app has proved unpopular: earlier, Vinted reversed a change concerning shipment methods due to shopper criticism.
A seasoned gaming analyst with over a decade of experience in online casinos, specializing in slot machine strategies and player psychology.