Members of the platform have expressed outrage after an update resulted in products showing incorrect sizing.
The popular resale platform has revised its sizing categories for women's and children's garments without notifying all shoppers about the modification.
Numerous buyers and vendors are posting online saying Vinted listings now show a different size category versus the original listing as a result of the reclassification.
Vinted explained the new system was more in line with other platforms.
They have suggested members to check their listings and manually change the size if necessary, which has left users frustrated.
Earlier, the sizing featured one number and one letter, for instance S/8 or M/10.
The new system has a letter with a size spectrum like S/UK 8-10.
In some cases, the sizing has been recategorised - such as a large size used to be a 12 but is now a UK 16-18.
One content creator, who makes TikTok content about plus-size fashion, said the change "makes both selling and buying harder".
"Few clothing companies classify XL as 20-22," the way the service now categorizes.
A different member, located in Scotland, stated items she posted on Vinted with size 14 labels were appearing on the platform as measurements 20-22.
"Should someone sized 20-22 purchase these they will likely be quite upset," she said.
Charlotte Lunn, from Derby, said she had been left angered due to the update requiring manual adjustment the sizes on "every single listing".
"Personally, this is quite irritating, since I have chronic health issues and Vinted sales have been crucial for me since losing part of my income," she explained.
The platform boasts over 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 represents another occasion when a surprising modification to the app has proved unpopular: previously, the platform withdrew an update regarding delivery choices after backlash from users.
A fashion journalist with over a decade of experience in luxury brands and sustainable fashion advocacy.
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Frank Parrish
Frank Parrish
Frank Parrish
Frank Parrish