Contrary to what many people think, height and weight really isn't a true judge to what size fits. People have different body types and something my fit differently on one person compared to another. Im a slimmer dude and don't like my clothes big so I cop Mediums. I tried on a Large and that shit was like a smock on me. Its about preference too. Does it really matter what size other dudes buy?
also, the fits have a lot to do with it
does that look out of place? im 6'0 180-185. and its a medium.
but im wearing shorts, so the whole outfit is sized down pretty much.
would that same shirt look right, if i had some some jeans on? nope
it all comes down to personal preference and what your wearing it with.