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Shoppers are voicing their frustration following a change that caused listings displaying inaccurate size information.
This online marketplace has revised its measurement guidelines for female and kids' apparel but did not contact all users about the change.
Many shoppers and sellers are expressing on platforms claiming that product pages now present a modified sizing category compared to what was initially listed due to the recalibration.
The company said the updated approach better aligns with other platforms.
It has advised users to examine their items and adjust the sizing manually where appropriate, causing user dissatisfaction.
Before the change, the sizes had both numerical and alphabetical indicators, such as S/8 or M/10.
The revised method features a letter and a range like S/UK 8-10.
With some products, the sizing has been recategorised - for example a size L used to be a 12 but now shows as UK 16-18.
Frankie Bridger, who produces content about larger sizing, said the change "makes both selling and buying harder".
"Few clothing companies classify XL as 20-22," which is what Vinted now does.
A different member, from Glasgow, stated items she posted featuring size 14 markings were appearing on the platform as larger sizing 20-22.
"Should someone sized 20-22 purchase these they're going to be very disappointed," she said.
Charlotte Lunn, based in Derby, explained she became annoyed because the modification necessitated personal updates the sizes on "every single listing".
"For me this is particularly frustrating, as I'm chronically ill and Vinted sales have been crucial for me since losing part of my income," she explained.
The platform boasts over 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 is not the initial instance that an unexpected update to the app has proved unpopular: previously, the platform withdrew an update regarding delivery choices due to shopper criticism.
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