To provide a hat which can easily be made by anyone in a short time using a sheet of material cloth without cutting it during the hat making process with the cloth's shape producing no odd waste cut pieces, and to provide a method for sewing the hat.

This hat 1 is made by the following process: the side end rims of a material cloth 10 are sewn together into a cylindrical form and a plurality of pleats 20 are formed by folding the upper part of the headgear portion of the cylindrical form; subsequently, each of the free flap parts 20b of these pleats 20 is closely sewn in a restricted fashion so as to be overlapped on the adjoining free flap part 20b to form a headgear part 2; next, the lower end rim of the material cloth 10 is folded back upward and the upper rim of the folded-back part is sewn in with a given width vertically; the thus formed brim core-holding part 35 and band threading part 30 are then inserted with a brim core material 36 and a band 31 respectively to form a brim 3.