Vinted users have been reacting angrily following a change that caused items being listed as the wrong size.
This online marketplace has altered its measurement guidelines for women's and children's clothes without notifying every member regarding the update.
Many shoppers and sellers are expressing on platforms stating that platform listings now display a different size category than originally posted because of the remapping.
Vinted explained the new system was more in line with similar services.
It has advised users to check their listings and adjust the sizing manually if necessary, resulting in member annoyance.
Previously, the measurements included numerical and alphabetical indicators, such as S/8 or M/10.
The revised method features 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 used to be a 12 but now shows as UK 16-18.
One content creator, who produces content about larger sizing, said the change "makes both selling and buying harder".
"Rarely do manufacturers list XL as sizes 20-22," as the platform currently indicates.
Another user, from Glasgow, said garments she listed on Vinted with size 14 labels were showing in the marketplace as larger sizing 20-22.
"Should someone sized 20-22 purchase these they may become frustrated," she explained.
Another shopper, located in England, said she had been left angered due to the update requiring manual adjustment the measurements for "each individual item".
"Personally, this is quite irritating, because of my ongoing medical condition and platform income has been essential after experiencing income reduction," she stated.
The app has more than 100 million users, 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 platform withdrew an update regarding delivery choices following member complaints.
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