Members of the platform have expressed outrage following a change that caused products showing incorrect sizing.
This online marketplace has revised its measurement guidelines for women's and children's garments without notifying all shoppers about the modification.
Many shoppers and sellers are expressing on platforms stating that platform listings now display an altered size classification versus the original listing because of the remapping.
The platform stated the revised method more closely matches similar services.
The platform has recommended to examine their items and manually change the size if necessary, resulting in member annoyance.
Previously, the sizes had both a single numeric size and a letter, such as S/8 or M/10.
The revised method features a letter with a size spectrum like S/UK 8-10.
With some products, the size labels have been reassigned - such as a large size used to be a 12 but currently displays as UK 16-18.
Frankie Bridger, who creates plus-size fashion videos, said the change "makes both selling and buying harder".
"Rarely do manufacturers list XL as sizes 20-22," the way the service now categorizes.
A different member, located in Scotland, said garments she listed on Vinted with size 14 labels were showing in the marketplace as measurements 20-22.
"If anyone [who is] size 20-22 buys them they will likely be quite upset," she said.
Charlotte Lunn, based in Derby, explained she became annoyed because the modification necessitated personal updates the sizes on "every single listing".
"This situation is especially annoying, as I'm chronically ill and Vinted sales have been crucial for me since losing part of my income," she said.
The platform boasts over 100 million members, comprising 18 million UK members.
It has become a favored option versus similar marketplaces including eBay and Depop.
This isn't the first time where an unanticipated change to the app has proved unpopular: earlier, the service retracted a modification concerning shipment methods due to shopper criticism.
Lena de Vries is a Dutch food writer and recipe developer who loves blending traditional flavors with modern twists.