My initial take on the delivered items...
Thermal garments 100 (almost lycra underwear), 150, 250 fit great, trim, leaves no extra bagginess. Sized per my suit measurements provided to Seaskin.
Nova suit:
For the test fit shown below I donned only the 150 thermals plus layered up my feet as per how I'll likely dive - thin wool socks, 4th Element Arctic socks, the suit with neo socks, and finally rock boots.
It was very snug getting into the suit, and I feel it could have used 1-2" more material width on torso and 1" more width per each leg. That's with the 150 thermals. I'm not certain the 250 would work at all given how snug the suit felt. Photos below appear to show enough extra room, but that's not how it all felt.
Maybe I just need to adapt to the crisp new stuff... my recent dives have been in a well used, heavy Waterproof D7x Cordura size ML, which actually fits pretty good with thermals and all. For this Nova... I might need to shed some body weight. On that note about weight, the Nova seems far lighter than the D7x, but the fabric (trilam) feels nicely sturdy.