I've got a longer torso and shorter legs, and I've never met a snowsuit or coveralls that fits both top and bottom, so I figure 2pc are my only good options for undergarments. A large 4E arctic with a large short legs fit well enough, with only a few inches of overlap.
I didn't even want to gamble on the SS undergarments, especially when it looks like that's where most of the duty costs are applied. Should have the drysuit in 2-3 weeks, fingers crossed their MTM shell is close enough for comfort.
Not sure if anyone noticed, but if you could use some midweight undergarments like Arctic, there is a new 2024 version out now, and the previous-gen Arctics are discounted by almost $100 at quite a few online retailers.