Vinted users have been reacting angrily after an update resulted in items being listed as the wrong size.
This online marketplace has updated its size classifications for women's and children's garments failing to inform all users about the change.
Many shoppers and sellers are expressing on platforms saying Vinted listings now show an altered size classification than originally posted due to the recalibration.
The company said the updated approach better aligns with other platforms.
They have suggested members to examine their items and manually change the size if necessary, which has left users frustrated.
Earlier, the sizing featured one number and one letter, like S/8 or M/10.
The new system has an alphabetical indicator and numerical range like S/UK 8-10.
With some products, the measurements have been reclassified - such as a large size was previously a 12 but now shows as UK 16-18.
One content creator, who produces content about larger sizing, stated the update "complicates both purchasing and selling".
"Not many brands say XL is a 20-22," as the platform currently indicates.
Another user, from Glasgow, stated items she posted 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 stated.
Another shopper, from Derby, stated she felt frustrated because the modification necessitated personal updates the sizes on "every single listing".
"For me this is particularly frustrating, because of my ongoing medical condition and platform income has been essential for me since losing part of my income," she stated.
The service features exceeding 100 million users, including 18 million in the UK.
It has proved a popular alternative versus similar marketplaces including eBay and Depop.
This is not the initial instance when a surprising modification on the platform has faced criticism: last year, the platform withdrew an update to its shipping options due to shopper criticism.
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