I've used the twin base layer approach before in deepest winter and it works surprisingly well better I think than using a single heavier weight layer. The TNF Flight T shirt weighs a miniscule 90g and has a tiny pack size. I was able to walk most of the weekend in this combination as there was some glorious sunshine and hardly any wind.
On Sunday morning when there was plenty of cloud cover and a bit of a breeze the TNF Apex shirt came into it's own. It kept off the wind chill and kept in the warmth and when the going got a bit too warm I was able to vent the front without too much difficulty.
The micro fleece was the only item that I didn't wear. My original intention was to use it as an extra layer when walking and as nightwear. However I ended up using it to prevent my water bottle and gas canister from freezing over night.
Hat and gloves went in rotation. The mountain cap was ideal for the cooler parts of the day but I could have done with a power stretch beanie that would have helped prevent my head from chilling at times but this wasn't a major issue. Apart from first thing in the morning or overnight I could have gotten by with just a beanie.
A pair of Extremities windy lite gloves did the trick for most of the trip, with a pair of TNF gauntlet type gloves (a bit of overkill to be honest) being used on Sunday until the sun put in an appearance.
I rarely use thermal leggings but in this case they were welcome. Even when working hard the leggings were always on the right side of comfortable even in the sun. The Red Point jacket was popped on and off at rest stops and kept on in the evenings as you'd expect.
Some useful experienced gained from my selection especially regarding headwear and I'll continue to use the double base layer on chillier days.