Shoppers are voicing their frustration after an update resulted in listings displaying inaccurate size information.
The popular resale platform has altered its sizing categories for women's and children's clothes but did not contact all shoppers about the modification.
Many shoppers and sellers have taken to social media saying Vinted listings now show a different size category than originally posted due to the recalibration.
The company said the revised method more closely matches similar services.
The platform has recommended to check their listings and manually change the size if necessary, causing user dissatisfaction.
Before the change, the sizing featured one number and one letter, for instance S/8 or M/10.
The updated approach includes an alphabetical indicator and numerical range such as S/UK 8-10.
In some cases, the measurements have been reclassified - such as a large size was previously a 12 but is now a UK 16-18.
One content creator, who creates plus-size fashion videos, said the change "makes both selling and buying harder".
"Not many brands say XL is a 20-22," the way the service now categorizes.
Stephanie Gallen, based in Glasgow, said garments she listed on Vinted with size 14 labels were showing in the marketplace as larger sizing 20-22.
"Should someone sized 20-22 purchase these they will likely be quite upset," she explained.
Charlotte Lunn, from Derby, stated she felt frustrated because the modification necessitated personal updates the sizing for "all her products".
"Personally, this is quite irritating, as I'm chronically ill and platform income has been essential for me since losing part of my income," she said.
The service features exceeding 100 million users, with 18 million British users.
It has emerged as a preferred choice compared to resale services such as eBay and Depop.
This isn't the first time that an unexpected update within the service has received backlash: previously, the service retracted a modification regarding delivery choices following member complaints.
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Sarah Johnson
Sarah Johnson
Sarah Johnson
Sarah Johnson
Sarah Johnson