>>47768901Sugimori himself stated it's a hat.
https://twitter.com/chicobo329/status/1078439436059373571I'd link to his tweet directly but Twitter won't let me access it for some reason, maybe because it's old as fuck. Basically he got asked if Brendan wears a white hat or if that's his hair and his answer was
>ニット帽子です!>It's a knitted hat! 