• Newform
• Nita Hats, Dallas
• Noreen Fashion
• Noreen Fashions
• Norman Durand
• Norman-Paulin
• NRA Label
• Odette Barsa
• Ogens, New York - Milwaukee
• Oh Hats
• Ohrlech's
• Oleg Cassini
• Olga
• Original Brandt
• Original by Lee Leon, New York
• Original by Sherman
• Original by Woodmere
• Original Caroline
• Original Chapeau by Louise
• Original Chapeaux Louise
• Original Emilio Sportswear, Capri
• Original Harry Margu Creation
• Original Hat Nip
• Original Henry Margu Creation