Zoom,
It depends where you get it from. My old stained "emergency in my bag" one is a converted airmans' hat with no lining and an officers badge. My "smart" comfy hat is a tailor's special manufactured from left overs and a badge made from a WSOp albatross and a FS crown. It has just a thin plain lining, and was MUCH cheaper than the standard "Moss Bros" buy. You can have a choice of coloured linings if you so wish!
As the artical in my post above states - they are made for comfort from spare scraps of cloth!