When you guy's talk about putting it on over some warmer clothing, what temperature range are you talking. I live in Northern Ontario, so my warm clothing may be a little heavier than your's. A perspective thing. That's pretty neat camo though.
The suit has a very generous cut to it. I am not sure what your cold weather attire consists of but I am pretty confident it would fit over your gear in the late season without any trouble.
Mine is baggy on me over my cold weather gear. My cold weather gear is good down to about 20 degrees F. It seldomly gets much colder than that here.