Shoppers are voicing their frustration due to a modification that led to listings displaying inaccurate size information.
The second-hand shopping app has updated its size classifications for women's and children's clothes without notifying all users about the change.
Numerous buyers and vendors are expressing on platforms saying Vinted listings now show a modified sizing category versus the original listing because of the remapping.
Vinted explained the updated approach better aligns with similar services.
The platform has recommended to check their listings and manually change the size if necessary, which has left users frustrated.
Before the change, the sizes had both numerical and alphabetical indicators, for instance S/8 or M/10.
The new system has an alphabetical indicator and numerical range for example S/UK 8-10.
With some products, the sizing has been recategorised - such as a large size was previously a 12 but now shows as UK 16-18.
A fashion influencer, who creates plus-size fashion videos, said the change "makes both selling and buying harder".
"Rarely do manufacturers list XL as sizes 20-22," which is what Vinted now does.
Another user, from Glasgow, said garments she listed with size 14 tags were displaying on the service as size 20–22.
"Should someone sized 20-22 purchase these they're going to be very disappointed," she said.
A different user, located in England, stated she felt frustrated by the change as she had to manually change the sizes on "every single listing".
"This situation is especially annoying, because of my ongoing medical condition and platform income has been essential after experiencing income reduction," she explained.
The service features exceeding 100 million users, including 18 million in the UK.
It has proved a popular alternative to second-hand platforms like eBay and Depop.
This is not the initial instance where an unanticipated change within the service has received backlash: last year, the platform withdrew an update regarding delivery choices after backlash from users.
Elena is a tech enthusiast and freelance writer specializing in gadget reviews and digital trends.