I’d also be interested in finding out more about the suit -for my 2 cents, i’d say you could with a few tight layers under it as i think its going to be a more streamlined fit. Are you wondering how this compares to the pyro or compared to a surf wetsuit?
In water 40 to 50 F less than 10 celcius and outside temp the same or lower, i’d say the drysuit would definitely be best. But also include the booties,gloves and hoodie!
The cold from both the water and air can possibly be bearable in a wetsuit for a while but they just rapidly drain your energy from the extra cold you are experiencing and then your hands freeze up way quicker and that pain is the worst!!.
The windchill is another consideration felt way more in a wetsuit.
I surf some pretty cold water in a wetsuit just below and above 10 C but generally the outside temp is in the 20 C range.
From what i’ve experienced, drysuits are definitely the way to go for Northern Hemisphere winter watersports.