PLAYERS SECTION VII - PLAYER RESPONSIBILITIES/ON-COURT RULES AND PROCEDURES c. Dress d. Undergarments e. Footwear A dress, for the purposes of permissible identification, is treated as a  combination of a skirt and shirt (dividing dress at waist). If commercial or manufacturer identifications are visible on regular tennis  undergarments, the identifications must comply with the number and  size restrictions for identifications on the applicable piece of clothing  under which the undergarment is worn. For leggings or compression shorts worn under a skirt, dress, or shorts,  one (1) manufacturer identification of up to two (2) square inches (13 sq.  cm) is allowed. Two (2) manufacturer identifications, neither of which exceeding two (2)  square inches (or 13 sq. cm) in size, may be placed on each sock. Standard manufacturer identifications may be placed on each shoe.  In Tournaments played on grass courts, players may wear only shoes  with rubber soles and without heels, ribs, or coverings. Players may wear special grass court shoes only with the express  approval of the WTA; such approval will be granted only if the shoes  comply with the following specifications: i.  Grass Court Shoes (a) Diameter The pimples or studs on the base of the sole are vertical from  the outsoul and have a maximum top diameter of three (3)  millimeters and a minimum top diameter of two (2) millimeters. The maximum height of the pimples or studs is two (2)  millimeters from the base of the shoe. (b) Height and Slope 130