Service dress uniforms are worn for official functions not rising to the level of full or dinner dress. They are also commonly worn when traveling in official capacity, or when reporting to a command. The civilian equivalent is a business suit. Service Dress Blue may be worn year-round, while Service Dress White is reserved for summer or tropical zones. Ribbons are worn over the left breast pocket in all variations of the service dress uniform. An all-weather overcoat or reefer coat may be worn with service dress uniforms in cold or inclement weather.