The material is wonderful! super comfortable to wear and always looks good! I actually wear it with almost everything like a thin cardigan (perfect for summer evenings or whenever you wanna wear it!) I'm 1,64 and wearing an S, for the cardigan-style an M probably would also be great!
This oversize shirt has a great cut and beautiful colour!
I wear it all the time for leisure and work.
sizewise: if you are a M better get an S