Shoppers are voicing their frustration 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.
Countless users and merchants have taken to social media saying Vinted listings now show a different size category than originally posted due to the recalibration.
The platform stated the revised method more closely matches similar services.
They have suggested members to review their products and manually change the size if necessary, causing user dissatisfaction.
Before the change, the measurements included one number and one letter, for instance S/8 or M/10.
The new system has an alphabetical indicator and numerical range such as S/UK 8-10.
For certain items, the measurements have been reclassified - such as a large size was previously a 12 but now shows as UK 16-18.
Frankie Bridger, who creates plus-size fashion videos, explained the modification "makes transactions more difficult".
"Not many brands say XL is a 20-22," the way the service now categorizes.
A different member, located in Scotland, said garments she listed with size 14 tags were appearing on the platform as size 20–22.
"If buyers measuring 20-22 acquire them they may become frustrated," she explained.
Another shopper, located in England, explained she became annoyed due to the update requiring manual adjustment the measurements for "each individual item".
"This situation is especially annoying, since I have chronic health issues and selling on Vinted has been paramount after experiencing income reduction," she said.
The app has more than 100 million shoppers, including 18 million in the UK.
It has become a favored option versus similar marketplaces including eBay and Depop.
This isn't the first time that an unexpected update within the service has received backlash: earlier, the service retracted a modification concerning shipment methods due to shopper criticism.
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