Shoppers are voicing their frustration after an update resulted in listings displaying inaccurate size information.
This online marketplace has updated its measurement guidelines for women's and children's clothes without notifying all users about the change.
Many shoppers and sellers are posting online stating that platform listings now display a modified sizing category than originally posted as a result of the reclassification.
Vinted explained the new system was more in line with similar services.
They have suggested members to check their listings and adjust the sizing manually if necessary, which has left users frustrated.
Before the change, the measurements included a single numeric size and a letter, like S/8 or M/10.
The revised method features a letter with a size spectrum like S/UK 8-10.
With some products, the size labels have been reassigned - like an L measurement used to be a 12 but is now a UK 16-18.
One content creator, who produces content about larger sizing, stated the update "complicates both purchasing and selling".
"Rarely do manufacturers list XL as sizes 20-22," which is what Vinted now does.
A different member, based in Glasgow, stated items she posted on Vinted with size 14 labels were showing in the marketplace as size 20–22.
"If anyone [who is] size 20-22 buys them they may become frustrated," she said.
A different user, from Derby, explained she became annoyed 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 Vinted sales have been crucial for me since losing part of my income," she stated.
The platform boasts over 100 million members, with 18 million British users.
It has proved a popular alternative to second-hand platforms like eBay and Depop.
This represents another occasion where an unanticipated change to the app has proved unpopular: last year, the platform withdrew an update regarding delivery choices due to shopper criticism.
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