Shoppers are voicing their frustration following a change that caused products showing incorrect sizing.
This online marketplace has updated its measurement guidelines for women's and children's garments without notifying every member regarding the update.
Countless users and merchants have taken to social media claiming that product pages now present a different size category versus the original listing due to the recalibration.
The company said the updated approach better aligns with similar services.
They have suggested members to examine their items and update the measurements by hand if necessary, causing user dissatisfaction.
Before the change, the sizing featured one number and one letter, like S/8 or M/10.
The updated approach includes an alphabetical indicator and numerical range like S/UK 8-10.
For certain items, the sizing has been recategorised - for example a size L used to be a 12 but now shows as UK 16-18.
One content creator, who makes TikTok content about plus-size fashion, stated the update "complicates both purchasing and selling".
"Not many brands say XL is a 20-22," the way the service now categorizes.
Another user, from Glasgow, stated items she posted with size 14 tags were displaying on the service as measurements 20-22.
"Should someone sized 20-22 purchase these they may become frustrated," she explained.
A different user, located in England, said she had been left angered by the change as she had to manually change the sizing for "all her products".
"For me this is particularly frustrating, since I have chronic health issues and Vinted sales have been crucial after experiencing income reduction," she stated.
The service features exceeding 100 million users, with 18 million British users.
It has proved a popular alternative versus similar marketplaces including eBay and Depop.
This isn't the first time where an unanticipated change on the platform has faced criticism: earlier, the service retracted a modification to its shipping options following member complaints.
Elena Vance is a digital strategist and creative director with over a decade of experience in transforming brands through innovative design.