Shoppers are voicing their frustration following a change that caused items being listed as the wrong size.
This online marketplace has updated its measurement guidelines for women's and children's garments but did not contact every member regarding the update.
Numerous buyers and vendors are posting online claiming that product pages now present a different size category compared to what was initially listed because of the remapping.
Vinted explained the updated approach better aligns with other platforms.
They have suggested members to examine their items and update the measurements by hand if necessary, which has left users frustrated.
Before the change, the sizes had both numerical and alphabetical indicators, like S/8 or M/10.
The revised method features a letter and a range for example S/UK 8-10.
With some products, the sizing has been recategorised - for example a size L used to be a 12 but currently displays as UK 16-18.
A fashion influencer, who creates plus-size fashion videos, stated the update "complicates both purchasing and selling".
"Few clothing companies classify XL as 20-22," as the platform currently indicates.
A different member, located in Scotland, stated items she posted with size 14 tags were displaying on the service as size 20–22.
"If buyers measuring 20-22 acquire them they may become frustrated," she said.
Another shopper, 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, because of my ongoing medical condition and selling on Vinted has been paramount following partial earnings loss," she explained.
The platform boasts over 100 million members, including 18 million in the UK.
It has proved a popular alternative versus similar marketplaces including eBay and Depop.
This represents another occasion where an unanticipated change within the service has received backlash: last year, the service retracted a modification to its shipping options after backlash from users.
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