baseball-style cap is worn when not riding. Rural Patrol Unit: Cargo shirt and trousers in olive green are worn with either a dark blue baseball-style cap or a navy blue beret. Cargo shirt and trousers in Disruptive Pattern Camouflage is also sometimes worn. Other specialized units: In some specialized units, a cargo shirt is worn in either olive green, dark blue, or disruptive pattern camouflage (depending on the unit), along with matching cargo trousers, and a navy blue beret or a dark blue baseball-style cap. Ceremonial uniform Ceremonial uniforms include either a white (similar to No.3 Warm weather ceremonial uniform) or navy blue tunic (similar to the old winter uniform). Sword design was based on 1897 pattern British Army infantry officer's sword and used for formal occasions such as parade out or Legal Opening Day. They are fitted with a black whistle on the front right pocket and insignia on the collar for commissioned officers. A Sam Browne belt is also worn. Retired uniforms The previous uniforms were reminiscent of the British colonial era, and were replaced with what were intended to be more modern, international, and cosmopolitan uniforms in 2005. Retired summer uniform: A short-sleeved olive green tunic-style tropical field shirt, and olive green trousers worn with a black Sam Browne belt with shoulder strap. Female officers wore a short-sleeved beige shirt with a knee-length skirt until the mid-1990s when they were given the same uniform as male officers (without the shoulder strap). Bermuda shorts were worn by male officers instead of trousers from the early 20th century until the 1970s. Retired winter uniform: A cornflower blue (or white, for commissioned officers) shirt with a blue and red striped necktie, worn under a heavy navy blue tunic coat and a Sam Browne Belt with shoulder strap, and navy blue trousers. The tunic may be removed and shirt sleeves folded up to the elbows when working indoors or in warmer weather. Retired headgear: Pith helmets, turbans and conical hats were worn (depending on the ethnicity of the officer) in the 19th and early 20th centuries. Berets, peaked caps and bowler hats (for female officers) were introduced in the early to mid-20th century. Baseball-style caps for some specialized units were also introduced in the early 21st century. Until 1998, all officers wore a black whistle lanyard over the left shoulder running under the epaulet with the double cord attached to a