Shoppers are voicing their frustration following a change that caused items being listed as the wrong size.
The second-hand shopping app has altered its sizing categories for female and kids' apparel but did not contact all users about the change.
Countless users and merchants are expressing on platforms stating that platform listings now display a modified sizing category versus the original listing because of the remapping.
The company said the updated approach better aligns with other platforms.
It has advised users to check their listings and manually change the size when needed, resulting in member annoyance.
Earlier, the measurements included numerical and alphabetical indicators, for instance S/8 or M/10.
The updated approach includes an alphabetical indicator and numerical range for example S/UK 8-10.
With some products, the size labels have been reassigned - for example a size L 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," which is what Vinted now does.
Stephanie Gallen, based in Glasgow, said garments she listed featuring size 14 markings were appearing on the platform as size 20–22.
"If buyers measuring 20-22 acquire them they're going to be very disappointed," she said.
Charlotte Lunn, located in England, said she had been left angered due to the update requiring manual adjustment the measurements for "each individual item".
"Personally, this is quite irritating, as I'm chronically ill and Vinted sales have been crucial for me since losing part of my income," she stated.
The platform boasts over 100 million members, comprising 18 million UK members.
It has become a favored option to second-hand platforms like eBay and Depop.
This isn't the first time where an unanticipated change on the platform has faced criticism: last year, the service retracted a modification regarding delivery choices following member complaints.
Elena Vance is a seasoned journalist and tech enthusiast, known for her insightful analysis and engaging storytelling across various media platforms.