VINTAGE Halter Brothers Straw Hat Made in Italy UNISEX It is surprisingly difficult to measure the inner circumference of a hat. I measure approx 22.5”. The outer circumference is 23.5”. I typically wear a hat size 7 1/8 and it fits me well. I would say this is probably unisex. Gently worn. ✔️ Same or next business day shipping ✔️ Bundle and save!