In reply to J72:
Many years ago, early June, I did a 5 day trek from the Linn o' Dee, stitching all 20 circa-Cairngorm Munros , Sgarsoch to Bhreac.
Day 4, slogging up Cairn Gorm from Loch A'an, I stripped down to running shorts, socks and boots. On the summit, a bloke who'd wandered up from the top station, sports jacket and suede shoes, in all seriousness upbraided me for being so scantily clad on the high tops. I thanked him for his concern, gave a brief outline of my trip, and assured him I would be fine.