The official Yeezy Supply page explicitly tells you to order a half size up. Does that mean that's the canon sizing and not just a thing everyone decided to do? : r/yeezys
BEFORE YOU BUY! The Definitive Yeezy 350 and 350 CMPCT Sizing Guide (2022) - YouTube
Here's why you size up on Yeezy V2s. : r/Sneakers
Guide to the adidas Yeezy Boost 350: Sizing, Care, and Popular Colorways - Stadium Goods Journal