Members of the platform have expressed outrage due to a modification that led to items being listed as the wrong size.
The second-hand shopping app has updated its sizing categories for women's and children's garments without notifying all users about the change.
Social Media Response
Many shoppers and sellers are expressing on platforms saying Vinted listings now show a different size category than originally posted as a result of the reclassification.
The company said the updated approach better aligns with comparable marketplaces.
They have suggested members to review their products and update the measurements by hand when needed, resulting in member annoyance.
Size Classification Updates
Earlier, the sizes had both numerical and alphabetical indicators, for instance S/8 or M/10.
The updated approach includes an alphabetical indicator and numerical range for example S/UK 8-10.
With some products, the measurements have been reclassified - for example a size L was formerly size 12 but currently displays as UK 16-18.
Shopper Accounts
Frankie Bridger, who makes TikTok content about plus-size fashion, stated the update "complicates both purchasing and selling".
"Few clothing companies classify XL as 20-22," the way the service now categorizes.
Stephanie Gallen, from Glasgow, said garments she listed featuring size 14 markings were displaying on the service as larger sizing 20-22.
"If anyone [who is] size 20-22 buys them they may become frustrated," she explained.
Manual Updates
A different user, from Derby, said she had been left angered because the modification necessitated personal updates the measurements for "each individual item".
"For me this is particularly frustrating, because of my ongoing medical condition and selling on Vinted has been paramount after experiencing income reduction," she said.
Marketplace Information
The app has more than 100 million shoppers, with 18 million British users.
It has become a favored option compared to resale services such as eBay and Depop.
This isn't the first time that an unexpected update within the service has received backlash: earlier, the service retracted a modification to its shipping options after backlash from users.
