In reply to Hyphin:
An Arran pattern wooly jumper, Knitted by my Nana... I provided the requisite number of balls of the specifed type of wool and some kind of special grandmother magic later I had a jumper...
It's been an erstwhile and hardy midlayer for climbing, walking and even kayaking (it was -12 and blowing a hoolie, so under the drysuit it went)... The deep polo-neck collar acts as a neck gaiter if needs be, and the whole thing is exceptionally warm for its weight, doesn't seem to absorb too much water, is increadibly breathable and generally outperforms every other insulating garment I own (even the pack size is pretty decent).
Only downside is I have to hand wash, lay out and slowly dry it once in a while to get it to shrink back to the original shape without shrinking too much.