Around 5'10 5'11. I use a medium for ice hockey but a lot of chestys don't fit me well in the arms. I have slightly longer arms that normal it seems. But Large usually seems to be too large.
But the worst fitting one i ever had was a Bauer reactor 9000 pro size medium. Was so tight in the arms and couldn't stretch them. Made the straps all loose and ended up falling on my elbow, cut it, got infected, was a disaster. So some medium doesn't fit me well.
Best fitting one is what i have now. A medium VE8 pro carbon.
I also use my ball hockey super loose though and use a dangler for neck protection when it droops
I also like to ramble on