Vinted users have been reacting angrily after an update resulted in items being listed as the wrong size.
The second-hand shopping app has updated its size classifications for women's and children's garments failing to inform all users about the change.
Countless users and merchants are posting online stating that platform listings now display a modified sizing category compared to what was initially listed as a result of the reclassification.
The platform stated the new system was more in line with other platforms.
The platform has recommended to check their listings and manually change the size if necessary, causing user dissatisfaction.
Before the change, the sizes had both numerical and alphabetical indicators, such as S/8 or M/10.
The updated approach includes a letter with a size spectrum such as S/UK 8-10.
For certain items, the measurements have been reclassified - such as a large size used to be a 12 but is now a UK 16-18.
One content creator, who produces content about larger sizing, said the change "makes both selling and buying harder".
"Not many brands say XL is a 20-22," the way the service now categorizes.
Another user, based in Glasgow, explained products she uploaded on Vinted with size 14 labels were displaying on the service as measurements 20-22.
"Should someone sized 20-22 purchase these they're going to be very disappointed," she explained.
Charlotte Lunn, from Derby, said she had been left angered because the modification necessitated personal updates the sizing for "all her products".
"For me this is particularly frustrating, since I have chronic health issues and Vinted sales have been crucial for me since losing part of my income," she said.
The service features exceeding 100 million shoppers, including 18 million in the UK.
It has become a favored option versus similar marketplaces including eBay and Depop.
This is not the initial instance where an unanticipated change within the service has received backlash: earlier, the platform withdrew an update concerning shipment methods following member complaints.