Members of the platform have expressed outrage due to a modification that led to listings displaying inaccurate size information.
The second-hand shopping app has altered its size classifications for women's and children's garments failing to inform every member regarding the update.
Many shoppers and sellers have taken to social media saying Vinted listings now show a different size category versus the original listing as a result of the reclassification.
Vinted explained the updated approach better aligns with comparable marketplaces.
They have suggested members to examine their items and adjust the sizing manually when needed, which has left users frustrated.
Before the change, the sizing featured one number and one letter, such as S/8 or M/10.
The updated approach includes a letter with a size spectrum like S/UK 8-10.
For certain items, the sizing has been recategorised - such as a large size used to be a 12 but now shows as UK 16-18.
One content creator, who creates plus-size fashion videos, explained the modification "makes transactions more difficult".
"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 showing in the marketplace as size 20–22.
"If buyers measuring 20-22 acquire them they're going to be very disappointed," she explained.
Another shopper, from Derby, said she had been left angered due to the update requiring manual adjustment the sizing for "all her products".
"For me this is particularly frustrating, because of my ongoing medical condition and selling on Vinted has been paramount following partial earnings loss," she explained.
The app has more than 100 million shoppers, including 18 million in the UK.
It has emerged as a preferred choice to second-hand platforms like eBay and Depop.
This represents another occasion where an unanticipated change within the service has received backlash: last year, the service retracted a modification regarding delivery choices following member complaints.
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