Members of the platform have expressed outrage due to a modification that led to products showing incorrect sizing.
The second-hand shopping app has revised its sizing categories for women's and children's garments failing to inform all shoppers about the modification.
Numerous buyers and vendors are expressing on platforms stating that platform listings now display a modified sizing category versus the original listing due to the recalibration.
The platform stated the updated approach better aligns with other platforms.
The platform has recommended to examine their items and manually change the size if necessary, resulting in member annoyance.
Previously, the sizing featured a single numeric size and a letter, for instance S/8 or M/10.
The new system has a letter and a range such as S/UK 8-10.
In some cases, the measurements have been reclassified - for example a size L was formerly size 12 but currently displays as UK 16-18.
One content creator, who produces content about larger sizing, stated the update "complicates both purchasing and selling".
"Not many brands say XL is a 20-22," which is what Vinted now does.
Stephanie Gallen, based in Glasgow, stated items she posted featuring size 14 markings were showing in the marketplace as larger sizing 20-22.
"Should someone sized 20-22 purchase these they may become frustrated," she explained.
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 Vinted sales have been crucial after experiencing income reduction," she explained.
The app has more than 100 million shoppers, comprising 18 million UK members.
It has proved a popular alternative 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: last year, the platform withdrew an update to its shipping options after backlash from users.
A tech analyst and business strategist with over a decade of experience in global markets, specializing in digital transformation and innovation.
