Eastern Airways' pilots wear hats...and we get a bollocking if we are seen in public view without them. Airside there is more latitude, but in terminals etc we are supposed to keep our jackets and hi-viz vests done up and our hats donned. Aim is to make us look smart (which it does)...if a little anachronistic. Our hat design (IMHO) is not the best as it is less broader than military hats, yet slightly taller...more like a 19th century era sea captain's hat.