Drum Majors, the field commanders and band directors, usually do not wear the regular band uniform, to better distinguish them from the rest of the band. Some wear more formal outfits or costumes that match the theme of the music, or most commonly a differently-designed version of the regular band uniform, often employing different colors (especially white) or features such as capes. Some (especially at the college level) still employ the tall wool-lined shako or much larger bearskin (both often derisively referred to as a "Q-Tip hat"). Sousaphone players may use a military-style beret or entirely forgo the use of a head covering, as most hats may be in the way of the bell. Some auxiliary groups use uniforms that resemble gymnastics outfits: Often, these uniforms are themed, drawing inspiration from the music. Many auxiliary groups change the outfits they use from season to season based on the needs of the band, although some that do also have a "base" uniform for occasions such as parades or other ceremonies.