Navy blue or coyote brown, plain without lettering or designs, made of 100% cotton, quarter-length sleeve, with an elliptical (crew-neck) collar.
Wear right side out, front of shirt to front of body. When worn with uniform trousers, the t-shirt will remain tucked in. The navy blue undershirt is worn with the NWU Type I and optionally worn with coveralls. The coyote brown undershirt is worn with the NWU Type II, III and optionally (blue or coyote brown) worn with the coveralls. Organizationally issued or personally purchased thermal underwear is authorized for wear underneath the undershirt and will not be visible when worn.
Last name and initials on the outside of the front, 1 inch from the bottom of the shirt and at right of the center.
Optional wear of nursing T-shirts is authorized for nursing Sailors. Nursing T-shirts may be long or short sleeve and must be white when worn with Service Uniforms, coyote brown when worn with the NWU Type II and III, blue when worn with the NWU Type I and black when worn with Flight Suits. Long sleeve nursing T-shirts will be worn with fully extended long sleeve uniform shirt/blouses. Nursing T-shirt will be worn tucked-in unless worn with maternity uniforms. When worn with maternity uniforms, the T-shirt will not extend beyond nor be visible below the hem of the maternity top being worn. Removal of a uniform shirt/blouse when wearing a nursing T-shirt is authorized only in designated lactation rooms. Nursing T-shirts are not authorized in environments requiring safety or organizational clothing.
1. Optional command logos are authorized on front and back of t-shirts worn with working/utility uniforms (NWU Type I/II/III, Navy coveralls, and Navy flight suits.
2. T-shirts worn with command logos are authorized for wear as civilian clothing by commanding officer discretion.
3. Black t-shirts are authorized for wear with flight suits ONLY.