Members of the platform have expressed outrage following a change that caused products showing incorrect sizing.
The second-hand shopping app has altered its measurement guidelines for female and kids' apparel without notifying every member regarding the update.
Many shoppers and sellers are posting online claiming that product pages now present a different size category than originally posted as a result of the reclassification.
The platform stated the revised method more closely matches similar services.
They have suggested members to review their products and adjust the sizing manually if necessary, which has left users frustrated.
Earlier, the measurements included one number and one letter, for instance S/8 or M/10.
The updated approach includes a letter and a range such as S/UK 8-10.
For certain items, the sizing has been recategorised - like an L measurement was previously a 12 but currently displays as UK 16-18.
One content creator, who creates plus-size fashion videos, explained the modification "makes transactions more difficult".
"Rarely do manufacturers list XL as sizes 20-22," the way the service now categorizes.
Another user, from Glasgow, stated items she posted with size 14 tags were showing in the marketplace as larger sizing 20-22.
"If buyers measuring 20-22 acquire them they may become frustrated," she said.
Another shopper, from Derby, said she had been left angered by the change as she had to manually change the sizing for "all her products".
"This situation is especially annoying, since I have chronic health issues and platform income has been essential for me since losing part of my income," she stated.
The service features exceeding 100 million shoppers, with 18 million British users.
It has proved a popular alternative to second-hand platforms like eBay and Depop.
This is not the initial instance where an unanticipated change within the service has received backlash: last year, Vinted reversed a change concerning shipment methods following member complaints.
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