I mentioned TNF Nuptse only because it's what I have in my kit. But the basic premise of many thin layers still obtains. The original topic I was responding to was how to make the MB inner down jacket useful in colder temperatures and I shared what I actually do and what worked. If I dispensed with the thin, 6 oz fleece, that would have been enough to push things right over the edge and I would have been one misserable puppy. But that isn't to say that's the right way or the only way. Your description would definitely work out just fine for plenty of poeple (but then MB was no longer the topic), but for me just unzipping a down jacket doesn't provide enough venting. Back in the day when I worked in the winter woods logging all I wore was a T shirt, Duofold longjohns and a wool shirt & pants. The work was demanding and relentless so that was all I needed. At the end of the day I would put on another wool shirt. Hence my affinity for Merino I guess. Lots of people won't go near it, preferring fleece instead, either because they're allergic to it or don't like that it's slow to dry. I find Merino luxurious, stink resistant, and I do my best to keep it dry as described. So with that in mind, the MB inner works well with the layers I have at hand: it's thin and works great insofar as an insulation layer and as a component of thermoregulation to prevent the layers from wetting out from too much perspiration.
