I have to admit to having quite a selection of hats I wear in the MOG depending on conditions/objectives (keep my solar panel warm or to stop it getting sunburnt). I have loads of baseball caps to keep the sun out of my eyes, a couple of woollen hats for when its really cold, and a "Baker Boys" cap that looks "authentic", but my current favourite is a soft leather cap that includes ear flaps that do up under the chin.