ALOHA! Many of the vintage Hawaiian Shirts do not have sizes. Because they are from different decades and made of different fabrics I have given the length and width measurements. The length is measured from the top of shirt, about 1 inch from the collar, to the hem, with front and back hems even. The width is measured with the shirt buttoned, seam to seam,in front and back. If you have a question about fit take a shirt that fits you well (with a straight across hem) and measure it this way, then you'll know if these great vintage shirts will fit...