Vinted users have been reacting angrily following a change that caused listings displaying inaccurate size information.
The popular resale platform has updated its size classifications for women's and children's garments but did not contact every member regarding the update.
Numerous buyers and vendors have taken to social media stating that platform listings now display an altered size classification versus the original listing due to the recalibration.
Vinted explained the updated approach better aligns with comparable marketplaces.
It has advised users to examine their items and adjust the sizing manually if necessary, which has left users frustrated.
Previously, the sizing featured numerical and alphabetical indicators, for instance S/8 or M/10.
The updated approach includes a letter with a size spectrum such as S/UK 8-10.
In some cases, the size labels have been reassigned - like an L measurement was previously a 12 but is now a UK 16-18.
A fashion influencer, who creates plus-size fashion videos, explained the modification "makes transactions more difficult".
"Rarely do manufacturers list XL as sizes 20-22," which is what Vinted now does.
Another user, located in Scotland, explained products she uploaded with size 14 tags were displaying on the service as measurements 20-22.
"If anyone [who is] size 20-22 buys them they will likely be quite upset," she said.
Charlotte Lunn, based in Derby, explained she became annoyed because the modification necessitated personal updates the measurements for "each individual item".
"Personally, this is quite irritating, because of my ongoing medical condition and selling on Vinted has been paramount following partial earnings loss," she stated.
The app has more than 100 million users, with 18 million British users.
It has become a favored option to second-hand platforms like eBay and Depop.
This isn't the first time when a surprising modification to the app has proved unpopular: last year, Vinted reversed a change concerning shipment methods due to shopper criticism.
Tech journalist and innovation analyst with over a decade of experience covering cutting-edge developments in AI and consumer electronics.