Members of the platform have expressed outrage due to a modification that led to listings displaying inaccurate size information.
This online marketplace has revised its measurement guidelines for women's and children's clothes but did not contact all shoppers about the modification.
Social Media Backlash
Many shoppers and sellers are posting online saying Vinted listings now show a different size category versus the original listing because of the remapping.
The company said the new system was more in line with other platforms.
It has advised users to check their listings and update the measurements by hand if necessary, which has left users frustrated.
Measurement Approach Updates
Before the change, the sizing featured numerical and alphabetical indicators, such as S/8 or M/10.
The updated approach includes a letter with a size spectrum for example S/UK 8-10.
With some products, the measurements have been reclassified - such as a large size used to be a 12 but currently displays as UK 16-18.
Member Experiences
A fashion influencer, who creates plus-size fashion videos, stated the update "complicates both purchasing and selling".
"Rarely do manufacturers list XL as sizes 20-22," the way the service now categorizes.
Another user, based in Glasgow, stated items she posted featuring size 14 markings were displaying on the service as larger sizing 20-22.
"If buyers measuring 20-22 acquire them they're going to be very disappointed," she explained.
Required Changes
A different user, located in England, explained she became annoyed by the change as she had to manually change the sizing for "all her products".
"This situation is especially annoying, as I'm chronically ill and selling on Vinted has been paramount following partial earnings loss," she said.
Service Background
The app has more than 100 million members, comprising 18 million UK members.
It has become a favored option compared to resale services such as eBay and Depop.
This isn't the first time where an unanticipated change within the service has received backlash: last year, Vinted reversed a change to its shipping options after backlash from users.