Members of the platform have expressed outrage following a change that caused listings displaying inaccurate size information.
The second-hand shopping app has revised its size classifications for female and kids' apparel failing to inform all shoppers about the modification.
Countless users and merchants are expressing on platforms stating that platform listings now display an altered size classification compared to what was initially listed because of the remapping.
The company said the updated approach better aligns with similar services.
They have suggested members to check their listings and update the measurements by hand if necessary, resulting in member annoyance.
Before the change, the measurements included numerical and alphabetical indicators, 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 used to be a 12 but currently displays as UK 16-18.
One content creator, who creates plus-size fashion videos, said the change "makes both selling and buying harder".
"Few clothing companies classify XL as 20-22," which is what Vinted now does.
A different member, based in Glasgow, said garments she listed on Vinted with size 14 labels were showing in the marketplace as larger sizing 20-22.
"Should someone sized 20-22 purchase these they're going to be very disappointed," she explained.
A different user, based in Derby, stated she felt frustrated because the modification necessitated personal updates the sizes on "every single listing".
"This situation is especially annoying, since I have chronic health issues and Vinted sales have been crucial following partial earnings loss," she stated.
The service features exceeding 100 million members, with 18 million British users.
It has emerged as a preferred choice compared to resale services such as eBay and Depop.
This isn't the first time when a surprising modification on the platform has faced criticism: earlier, the platform withdrew an update to its shipping options after backlash from users.