I’m 6ft and 87kg, I have an athletic build and could have gone medium for a super slim fit but seeing as I’ve changed my gym routine lately I felt it wouldn’t be long until I needed to size up, I felt the armpits constricted a bit. Swapped out for a large and so glad I did. Looks great with a tee but can get away with a UHF or light sweater too.
Given your height and weight I’d be inclined to go medium. I think your stats are similar on paper to the guy that sells freenote near me. Autuer store on Instagram if you want to have a look at how his fits in medium.