I just got my Pinnacle 5mm Merino. I am pretty excited since it is my first suit. I ordered a Small one. It felt pretty great wearing that suit. However, I don't know what is a measurement of fit. Like when I move a bit, there is some room under my arms. Should there be any room at all ? How about the neck area ? When I move my neck, I feel there is a little bit of room there too.