In reply to GridNorth: Once tried a Lakes winter weekend wearing longjohns, with lots of walking inbetween ascents, without undies - bad idea!!
Ended up with nasty ringpiece burn from the seam in the longjohns, though it did leave me tagnut free and removed most of my arse-cress too, as well as plucking the odd extra-long pube from me scrote.
Missus wasn't too pleased though - she had to 'Sudocrem' my glowing starfish outside the Black Sail hut so that I could get over the tops and back to the car in Langdale without too much grimacing and gurning.