Shoppers are voicing their frustration after an update resulted in items being listed as the wrong size.
This online marketplace has altered its size classifications for female and kids' apparel without notifying all users about the change.
Many shoppers and sellers are posting online claiming that product pages now present a different size category versus the original listing due to the recalibration.
The platform stated the revised method more closely matches other platforms.
They have suggested members to review their products and manually change the size where appropriate, causing user dissatisfaction.
Before the change, the sizing featured a single numeric size and a letter, such as S/8 or M/10.
The updated approach includes an alphabetical indicator and numerical range like S/UK 8-10.
In some cases, the size labels have been reassigned - for example a size L used to be a 12 but is now a UK 16-18.
Frankie Bridger, who makes TikTok content about plus-size fashion, said the change "makes both selling and buying harder".
"Few clothing companies classify XL as 20-22," as the platform currently indicates.
A different member, from Glasgow, said garments she listed on Vinted with size 14 labels were appearing on the platform as larger sizing 20-22.
"If buyers measuring 20-22 acquire them they're going to be very disappointed," she stated.
A different user, located in England, said she had been left angered by the change as she had to manually change the sizing for "all her products".
"For me this is particularly frustrating, because of my ongoing medical condition and selling on Vinted has been paramount after experiencing income reduction," she explained.
The service features exceeding 100 million users, including 18 million in the UK.
It has become a favored option versus similar marketplaces including eBay and Depop.
This represents another occasion when a surprising modification within the service has received backlash: earlier, the service retracted a modification concerning shipment methods after backlash from users.
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