Amazon.com: FORBUSITE Church Hats for Women Black Derby Hats 。Size Chart- Medium best fits for 55-58CM 21.6\"-22.8\" 6 7/8- 7 1/4, Large best fits for 58-60CM 22.8\"-23.6\" 7 1/4 - 7 1/2 ,with Chin Strap and an adjustable drawstring built inside sweatband. FASHIONABLE & VERSATILE - looks cool on casual and formal occasions like 1920s / 1950s tea party, derby, church, wedding or theatre; but also keeps you warm and stylish in fall winter and spring. CRUSHABLE & PACKABLE - you can fold or roll-up it and tuck in away in suitcase or backpack, great for parties, outdoor walking, holiday vacation and the like. Also it can regain its shape easily.