The United States Navy

Service uniforms are designed for daily wear and are most often worn in office or classroom-type settings, as well as other occasions in which physical activity is at a minimum. The most visible distinction between officers and enlisted personnel are the color of the service uniform. Only officers and chief petty officers are authorized to wear Service Khaki or Service White; all other personnel must wear the Navy Service Uniform (which will eventually replace Winter Blue and Summer White).
Working uniforms prioritize comfort and safety first and thus are the most utilitarian of the Navy uniforms. They are intended for use in underway ships and in occasions that involve dirty, physical labor. Many working uniforms are variations of the service uniforms except with less formal requirements. This category includes Navy coveralls, which are authorized to be worn by members of all ranks.
Recently, the Navy completed a project named "Task Force Uniform" to streamline Navy uniforms. Among the changes are that enlisted personnel from Seaman Recruit to Petty Officer First Class (E1–E6) will have one year-round service uniform instead of winter blues and summer whites. All personnel from Seaman Recruit to Admiral will also have new working uniforms dubbed Navy Working Uniform (NWU) to replace the wash khakis, coveralls, utilities, and aviation working greens currently in use. The uniform is a digital patterned camouflage in predominantly haze gray and blue hues.
Grooming for both male and female sailors is regulated to a high degree, with exact standards in regards to hair, facial hair, use of cosmetics, and jewelry. New male recruits are given the military crew cut and are prohibited from having hair longer than four inches (102 mm) while in the service. Men are required to be clean shaven at all times, although mustaches are allowed. Women do not have a hair length regulation, however hair cannot fall past the bottom edge of the uniform collar and the style of hair is strictly controlled. Multicolored hair, body piercing, and tattoos on the head, neck, and hands are banned for both sexes.