Shoppers are voicing their frustration after an update resulted in items being listed as the wrong size.
This online marketplace has updated its size classifications for female and kids' apparel without notifying all shoppers about the modification.
Numerous buyers and vendors have taken to social media claiming that product pages now present a modified sizing category than originally posted due to the recalibration.
The company said the revised method more closely matches other platforms.
It has advised users to review their products and manually change the size if necessary, resulting in member annoyance.
Previously, the sizes had both a single numeric size and a letter, like S/8 or M/10.
The revised method features a letter with a size spectrum like S/UK 8-10.
For certain items, the measurements have been reclassified - for example a size L was formerly size 12 but currently displays as UK 16-18.
Frankie Bridger, who creates plus-size fashion videos, said the change "makes both selling and buying harder".
"Not many brands say XL is a 20-22," which is what Vinted now does.
A different member, from Glasgow, said garments she listed with size 14 tags were showing in the marketplace as measurements 20-22.
"Should someone sized 20-22 purchase these they're going to be very disappointed," she stated.
A different user, from Derby, said she had been left angered because the modification necessitated personal updates the measurements for "each individual item".
"For me this is particularly frustrating, because of my ongoing medical condition and selling on Vinted has been paramount following partial earnings loss," she explained.
The service features exceeding 100 million shoppers, with 18 million British users.
It has become a favored option to second-hand platforms like eBay and Depop.
This represents another occasion that an unexpected update to the app has proved unpopular: last year, the service retracted a modification concerning shipment methods following member complaints.
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