I`m 5`8 and weigh 80kgs... so a little podgy.
Bought the trousers in medium (I have 32 inch waist) and they fit perfect. The Jacket was bought primeraly for winter touring so went with a large. Problem is that the jacket is so good that I also started to use it on my cyclocross commute, which is 25km`s each way. The jacket and trousers withstand the worst norwegian downpours for well over an hour and have some great reflective detils which are important becuase it is dark all day here in the winter.

I`m so happy that I will also buy one in medium for the roadbike and cyclocross for a tighter fit but keep the large for the Fatbike touring.

My advice on the sizing would be that if you are in dought... size down on the jacket.