This hat can be used as custom item for Minifigs. It's modelled according to drawings of British Infantry units of the Napoleonic area. Since also other units of this time were using this "Ofenrohr" design it can be used for German, Dutch, Austrian or other nations. In difference to the original Minifig piece there's a plume at the top of the hat.
Take also a look at the much cheaper packs section or ask for one if it's not available.