Shoppers are voicing their frustration due to a modification that led to items being listed as the wrong size.
This online marketplace has updated its sizing categories for women's and children's clothes without notifying all shoppers about the modification.
Many shoppers and sellers have taken to social media stating that platform listings now display a different size category versus the original listing as a result of the reclassification.
The platform stated the revised method more closely matches similar services.
The platform has recommended to examine their items and manually change the size when needed, resulting in member annoyance.
Before the change, the sizing featured a single numeric size and a letter, like S/8 or M/10.
The updated approach includes an alphabetical indicator and numerical range such as S/UK 8-10.
For certain items, the size labels have been reassigned - such as a large size used to be a 12 but currently displays as UK 16-18.
One content creator, who creates plus-size fashion videos, stated the update "complicates both purchasing and selling".
"Few clothing companies classify XL as 20-22," the way the service now categorizes.
Another user, based in Glasgow, explained products she uploaded with size 14 tags were showing in the marketplace as size 20–22.
"If buyers measuring 20-22 acquire them they may become frustrated," she explained.
A different user, located in England, stated she felt frustrated by the change as she had to manually change the sizing for "all her products".
"This situation is especially annoying, because of my ongoing medical condition and Vinted sales have been crucial after experiencing income reduction," she said.
The service features exceeding 100 million shoppers, including 18 million in the UK.
It has emerged as a preferred choice to second-hand platforms like eBay and Depop.
This isn't the first time that an unexpected update on the platform has faced criticism: previously, Vinted reversed a change concerning shipment methods due to shopper criticism.
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