If you can get away with wearing just base layers and midweight pants in 35 degrees, you are tougher than me! Also, the times I've worn my solitude bibs, I've only worn midweight merino base layers under them, so I'm sure if I wore a pair of pants in there, it would keep me warmer.
I maybe spoke too quickly before - I feel like with heavyweight bases (and maybe a pair of pants) under the solitudes, I'd probably be fine in the mid to lower 20s. Ive also noticed that the only parts of my legs that feel a chill is along the zippers down the outside.
I've used a Heater Body Suit quite a bit in the last 10 years but feel like its a little overkill and bulky when its above 20 (and the majority of my november hunting here in Iowa is 25-30 in the morning and a high of 45ish for the day). I wanted some bibs to wear between HBS temps and uninsulated pant temps which is why I bought the sanctuary a year or two ago, but they are definitely heavy and warm for those temps, so I think the solitude works alright. I guess I was just expecting they would be slightly warmer than they are considering how warm the sanctuary bibs are.
The handwarmer pocket on the lower chest is awesome tho! Makes me want to "upgrade" my woodbury jacket to the solitude jacket so I can use it all the time!