Shoppers are voicing their frustration after an update resulted in listings displaying inaccurate size information.
This online marketplace has altered its measurement guidelines for women's and children's garments without notifying every member regarding the update.
Countless users and merchants are expressing on platforms claiming that product pages now present a different size category than originally posted because of the remapping.
The company said the new system was more in line with other platforms.
They have suggested members to review their products and manually change the size where appropriate, resulting in member annoyance.
Earlier, the sizes had both a single numeric size and a letter, for instance S/8 or M/10.
The revised method features a letter with a size spectrum such as S/UK 8-10.
In some cases, the measurements have been reclassified - like an L measurement used to be a 12 but now shows as UK 16-18.
Frankie Bridger, who creates plus-size fashion videos, stated the update "complicates both purchasing and selling".
"Not many brands say XL is a 20-22," the way the service now categorizes.
Stephanie Gallen, based in Glasgow, said garments she listed featuring size 14 markings 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 stated.
Charlotte Lunn, from Derby, explained she became annoyed because the modification necessitated personal updates the sizes on "every single listing".
"For me this is particularly frustrating, as I'm chronically ill and selling on Vinted has been paramount after experiencing income reduction," she said.
The platform boasts over 100 million shoppers, including 18 million in the UK.
It has proved a popular alternative compared to resale services such as eBay and Depop.
This isn't the first time when a surprising modification on the platform has faced criticism: previously, the platform withdrew an update concerning shipment methods after backlash from users.
Elara Vance is a tech journalist and business analyst with over a decade of experience covering digital transformation and startup ecosystems.