Which was the first U.S. company to trademark its service uniforms?

The Playboy Bunny outfit was the first service uniform registered with the United States Patent and Trademark Office (U.S. trademark registration number 0762884). The costume was made from rayon-satin constructed on a strapless merry widow corset teddy. Satin bunny ears, cotton tails, collars with bow ties, cuffs with cuff links, black sheer to waist pantyhose and matching high-heeled shoes completed the outfit. A name tag on a satin rosette was pinned over the right hip bone.