Shoppers are voicing their frustration due to a modification that led to products showing incorrect sizing.
The second-hand shopping app has altered its size classifications for female and kids' apparel failing to inform all users about the change.
Countless users and merchants have taken to social media stating that platform listings now display a modified sizing category versus the original listing due to the recalibration.
The platform stated the new system was more in line with comparable marketplaces.
They have suggested members to check their listings and adjust the sizing manually when needed, which has left users frustrated.
Previously, the sizing featured one number and one letter, like S/8 or M/10.
The new system has a letter with a size spectrum such as S/UK 8-10.
In some cases, the size labels have been reassigned - such as a large size used to be a 12 but currently displays as UK 16-18.
A fashion influencer, who produces content about larger sizing, 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, stated items she posted on Vinted with size 14 labels were displaying on the service as larger sizing 20-22.
"If anyone [who is] size 20-22 buys them they're going to be very disappointed," she stated.
A different user, from Derby, stated she felt frustrated by the change as she had to manually change the sizing for "all her products".
"Personally, this is quite irritating, because of my ongoing medical condition and Vinted sales have been crucial after experiencing income reduction," she explained.
The service features exceeding 100 million users, with 18 million British users.
It has proved a popular alternative to second-hand platforms like eBay and Depop.
This isn't the first time when a surprising modification within the service has received backlash: last year, Vinted reversed a change to its shipping options after backlash from users.
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