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Members of the platform have expressed outrage following a change that caused items being listed as the wrong size.
This online marketplace has revised its sizing categories for women's and children's garments failing to inform all shoppers about the modification.
Numerous buyers and vendors are expressing on platforms claiming that product pages now present a different size category versus the original listing as a result of the reclassification.
Vinted explained the new system was more in line with similar services.
The platform has recommended to review their products and update the measurements by hand where appropriate, causing user dissatisfaction.
Earlier, the measurements included a single numeric size and a letter, like S/8 or M/10.
The revised method features an alphabetical indicator and numerical range for example S/UK 8-10.
In some cases, the measurements have been reclassified - like an L measurement used to be a 12 but currently displays 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.
A different member, located in Scotland, explained products she uploaded featuring size 14 markings were displaying on the service as larger sizing 20-22.
"Should someone sized 20-22 purchase these they're going to be very disappointed," she said.
Charlotte Lunn, from Derby, stated she felt frustrated by the change as she had to manually change the sizes on "every single listing".
"Personally, this is quite irritating, since I have chronic health issues and Vinted sales have been crucial for me since losing part of my income," she said.
The platform boasts over 100 million members, with 18 million British users.
It has emerged as a preferred choice versus similar marketplaces including eBay and Depop.
This isn't the first time where an unanticipated change to the app has proved unpopular: earlier, the platform withdrew an update regarding delivery choices after backlash from users.
A seasoned betting analyst with over a decade of experience in UK gambling markets, specializing in data-driven wagering strategies.