I have to say that in my early days working on a huge and open expanse of a building site ground workers and myself as a plumber were the first on site and in the winter the wind would cut through you like a knife . Talking to one of the ground workers he recommended x army surplus clothing and he was spot on . The warmest gear I’d ever worn. So 100% use x armed forces gear as it will be well made ,good quality etc and if the armed forces get a percentage of the sale then even better