Members of the platform have expressed outrage following a change that caused listings displaying inaccurate size information.
The popular resale platform has updated its size classifications for women's and children's garments but did not contact all users about the change.
Numerous buyers and vendors have taken to social media stating that platform listings now display an altered size classification than originally posted because of the remapping.
The platform stated the updated approach better aligns with similar services.
They have suggested members to review their products and manually change the size if necessary, resulting in member annoyance.
Previously, the measurements included one number and one letter, like S/8 or M/10.
The new system has a letter and a range like S/UK 8-10.
For certain items, the sizing has been recategorised - such as a large size used to be a 12 but is now a UK 16-18.
One content creator, who makes TikTok content about plus-size fashion, said the change "makes both selling and buying harder".
"Rarely do manufacturers list XL as sizes 20-22," the way the service now categorizes.
Stephanie Gallen, located in Scotland, explained products she uploaded on Vinted with size 14 labels were appearing on the platform as measurements 20-22.
"If anyone [who is] size 20-22 buys them they will likely be quite upset," she explained.
A different user, from Derby, explained she became annoyed by the change as she had to manually change the sizing for "all her products".
"This situation is especially annoying, as I'm chronically ill and Vinted sales have been crucial following partial earnings loss," she explained.
The app has more than 100 million members, including 18 million in the UK.
It has become a favored option to second-hand platforms like eBay and Depop.
This represents another occasion that an unexpected update on the platform has faced criticism: last year, the platform withdrew an update regarding delivery choices due to shopper criticism.
Elena is a freelance writer and mindfulness coach who loves exploring the power of positive thinking.