Shoppers are voicing their frustration following a change that caused items being listed as the wrong size.
The second-hand shopping app has updated its size classifications for women's and children's clothes without notifying all users about the change.
Numerous buyers and vendors have taken to social media saying Vinted listings now show an altered size classification than originally posted because of the remapping.
Vinted explained the revised method more closely matches other platforms.
It has advised users to examine their items and adjust the sizing manually if necessary, causing user dissatisfaction.
Before the change, the sizing featured one number and one letter, for instance S/8 or M/10.
The new system has a letter and a range like S/UK 8-10.
For certain items, the measurements have been reclassified - for example a size L used to be a 12 but currently displays as UK 16-18.
A fashion influencer, who makes TikTok content about plus-size fashion, explained the modification "makes transactions more difficult".
"Rarely do manufacturers list XL as sizes 20-22," the way the service now categorizes.
Another user, based in Glasgow, said garments she listed featuring size 14 markings were showing in the marketplace as measurements 20-22.
"If buyers measuring 20-22 acquire them they may become frustrated," she explained.
Another shopper, from Derby, stated she felt frustrated because the modification necessitated personal updates the sizes on "every single listing".
"This situation is especially annoying, as I'm chronically ill and Vinted sales have been crucial for me since losing part of my income," she said.
The service features exceeding 100 million users, comprising 18 million UK members.
It has emerged as a preferred choice to second-hand platforms like eBay and Depop.
This isn't the first time where an unanticipated change on the platform has faced criticism: earlier, the service retracted a modification to its shipping options due to shopper criticism.
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