Articles of clothing must not incorporate features:
designed to assist the player with his alignment; or
that might otherwise assist the player in making a stroke or in his play.
Use of Compression Clothing: Compression clothing has been available for many years and its use is widespread in both the winter and summer for temperature regulation and sun protection. Compression garments are not considered unusual equipment and consequently are permitted under Rule 4.3.
Use of Posture Garments (e.g., shirts): Posture garments, as currently available (2012), are considered to be a type of compression garment and should be permitted under Rule 4.3. These include: Posture shirts, Posture/sports bras, Girdles, and Shaping undergarments. Clothing incorporating features designed to or which have the effect of: Storing and releasing energy, or Inhibiting or enhancing movement, are considered unusual equipment in breach of Rule 4.3.