Shoppers are voicing their frustration following a change that caused listings displaying inaccurate size information.
This online marketplace has updated its measurement guidelines for women's and children's garments without notifying all shoppers about the modification.
Numerous buyers and vendors have taken to social media saying Vinted listings now show an altered size classification than originally posted due to the recalibration.
Vinted explained the updated approach better aligns with comparable marketplaces.
The platform has recommended to check their listings and adjust the sizing manually where appropriate, resulting in member annoyance.
Before the change, the measurements included numerical and alphabetical indicators, for instance S/8 or M/10.
The updated approach includes an alphabetical indicator and numerical range for example S/UK 8-10.
For certain items, the size labels have been reassigned - like an L measurement 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".
"Few clothing companies classify XL as 20-22," as the platform currently indicates.
Stephanie Gallen, from Glasgow, explained products she uploaded with size 14 tags were displaying on the service as larger sizing 20-22.
"Should someone sized 20-22 purchase these they may become frustrated," she said.
Charlotte Lunn, from Derby, stated she felt frustrated by the change as she had to manually change the sizing for "all her products".
"Personally, this is quite irritating, since I have chronic health issues and platform income has been essential following partial earnings loss," she said.
The app has more than 100 million members, comprising 18 million UK members.
It has emerged as a preferred choice compared to resale services such as eBay and Depop.
This represents another occasion where an unanticipated change within the service has received backlash: previously, Vinted reversed a change to its shipping options following member complaints.
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