Artics ? Older ones where bigger mediums about 26 Large 27-28 I know they did a slimmer range about 5-6 years back so depends on year-model av had 5 There let down for me is the necks canny open, when it’s cold enough to wear one, you notice that, a bought a mccurdo about 5 years back and don’t even look at bigger winter jobs anymore
I had a Canadian made arctic parka in large a few years ago and it felt too big on, tried one on in flannels a couple of years ago (don’t know where it was made)in large again and it was spot on, ended up buying Belstaff from harvey nicks but doubt it’d be as warm.