Shoppers are voicing their frustration due to a modification that led to products showing incorrect sizing.
This online marketplace has revised its sizing categories for women's and children's clothes without notifying every member regarding the update.
Countless users and merchants are posting online saying Vinted listings now show an altered size classification than originally posted because of the remapping.
The company said the updated approach better aligns with similar services.
It has advised users to check their listings and adjust the sizing manually if necessary, causing user dissatisfaction.
Previously, the measurements included one number and one letter, such as S/8 or M/10.
The new system has a letter with a size spectrum for example S/UK 8-10.
With some products, the size labels have been reassigned - for example a size L was previously a 12 but currently displays as UK 16-18.
A fashion influencer, who creates plus-size fashion videos, stated the update "complicates both purchasing and selling".
"Rarely do manufacturers list XL as sizes 20-22," which is what Vinted now does.
A different member, located in Scotland, stated items she posted with size 14 tags were showing in the marketplace as size 20–22.
"If anyone [who is] size 20-22 buys them they may become frustrated," she said.
Charlotte Lunn, based in Derby, said she had been left angered due to the update requiring manual adjustment the sizes on "every single listing".
"This situation is especially annoying, since I have chronic health issues and selling on Vinted has been paramount 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 compared to resale services such as eBay and Depop.
This is not the initial instance when a surprising modification within the service has received backlash: last year, the service retracted a modification regarding delivery choices following member complaints.
Marcus Sterling is a financial analyst specializing in precious metals, with over 15 years of experience in global markets and investment strategies.