How Do Sacai's Fit?
Sacai's are one of those extremely rare shoes that almost always fit true to size. The buttery suede and mesh construction of the Sacai's allow the shoe to slightly stretch to fit your fit so even if you have particularly wide feet you should be good staying true to size. 
Are Sacai's Comfortable?
The short answer is yes the Sacai's are very comfortable shoes for all-day use. The thick foam sole provides plenty of support and bounces in every step and the materials used on the uppers help to support and hug your whole foot.
How To Style Sacai's?
Sacai's can be styled in all sorts of ways as they look good with just about any outfit. Cargo's look particularly good matched with Sacai's, but jeans, joggers, and shorts also look amazing so, just make sure your colours match.