Plaid Flat Cap in Stewart Royal Plaid - Made in Scotland from 100% Wool Made in Scotland from 100% Wool Small = 21.5 - 22 inches (Hat Size 6 3/4 - 6 7/8) Medium = 22.5 - 23 1/4 inches (Hat Size 7 - 7 1/4) Large = 23.5 - 24 inches (Hat Size 7 3/8 - 7 1/2) Extra Large = 24.5 inche (Hat Size 7 5/8)