Members of the platform have expressed outrage 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 clothes but did not contact all shoppers about the modification.
Social Media Reaction
Countless users and merchants have taken to social media saying Vinted listings now show a different size category versus the original listing because of the remapping.
Vinted explained the new system was more in line with similar services.
They have suggested members to review their products and adjust the sizing manually when needed, resulting in member annoyance.
Size Classification Changes
Earlier, the measurements included one number and one letter, such as S/8 or M/10.
The new system has an alphabetical indicator and numerical range such as S/UK 8-10.
In some cases, the measurements have been reclassified - for example a size L was previously a 12 but now shows as UK 16-18.
Shopper Experiences
A fashion influencer, who makes TikTok content about plus-size fashion, explained the modification "makes transactions more difficult".
"Few clothing companies classify XL as 20-22," as the platform currently indicates.
Stephanie Gallen, from Glasgow, stated items she posted on Vinted with size 14 labels were appearing on the platform as larger sizing 20-22.
"If anyone [who is] size 20-22 buys them they may become frustrated," she said.
Required Changes
A different user, from Derby, explained she became annoyed due to the update requiring manual adjustment the measurements for "each individual item".
"Personally, this is quite irritating, because of my ongoing medical condition and Vinted sales have been crucial for me since losing part of my income," she said.
Service Background
The app has more than 100 million members, including 18 million in the UK.
It has emerged as a preferred choice to second-hand platforms like eBay and Depop.
This isn't the first time that an unexpected update on the platform has faced criticism: previously, the service retracted a modification regarding delivery choices after backlash from users.