Gucci sizing is unique because it often follows Italian sizing standards, which are known to run significantly larger than US or standard EU sizes.
For example, a Gucci Ace Sneaker size 39 IT can fit like a 40 EU. It is essential to check before buying luxury footwear.
Yes, very big. For Ace sneakers and loafers, size down by 1 full size.
Yes, Gucci uses IT sizing. 39 IT usually equals 40 EU.
Gucci slides tend to run small. Size up if you are between sizes.
Gucci sometimes implies "G" for their own sizing system on men's shoes, which is roughly UK sizing.
Rhyton sneakers fit true to size, unlike the Ace.