survival suits

[Bjm]

Hi,
I was thinking about if we had to bug out in a hurry,in the winter, and
i was thinking that on my boat i have survival suits for much the same reasons, warm,waterproof,all in one suit, although bright orange could be a good way of keping warm while resting/sleeping until we got to our destination and set up camp.
My thorghts are that they would be good especialy for older and younger members.
What are your thorghts??