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
A full Size Guide for Every Yeezy Model - Yeezy 350, 500s, 700s and more!
Yeezy 350 Sizing Guide: How to Choose the Right Size for You - Read This First
Yeezy x Adidas Core Black/Red Cotton Knit Boost 350 V2 Sneakers Size 47.5 Yeezy x Adidas | TLC