Originally Posted by
81romeo
Just skinny...1,83m tall and 64Kg heavy...
DO NOT go for S! I emphasise this due to your height, not the weight. Your legs will look very funny in S.
I'm a lot shorter than you (about 164 cm) but the bottoms are a little too short even for me.
My husband is 6'3" but not fat by any means and M is a bit short on the legs but it's overall OK, although a little bit loose.
So, go for M.