The Service Dress Blue (SDB) uniform consists of a navy blue suit coat and trousers (or the optional skirt for women) that are nearly black in color, a white shirt, and a four-in-hand necktie for men or a neck tab for women. The material is generally wool or a wool blend, depending on the vendor. The men’s jacket is double breasted with six gold-colored buttons, and the women’s jacket has a single row of four gold-colored buttons. Rank insignia is the gold sleeve stripes for commissioned officers, while rating badges and service stripes are worn on the left sleeve by Chief Petty Officers (CPOs). The prescribed headgear is the white combination cap, although a navy blue garrison cap is optional, unless stated otherwise by the prescribing authority in some situations when the jacket is not worn. Beginning in 2016, the Navy began phasing out the female combination cap and now prescribes a cover similar to the male version for female officers and CPOs. Commissioned and warrant officers wear a cap badge of the American shield and eagle in silver upon gold crossed anchors; CPOs wear a single fouled anchor. The combination cover’s chinstrap is gold for commissioned and warrant officers, narrower gold for midshipmen, and black for CPOs. Female officers and chief petty officers wear beltless slacks with the SDB, although since January 2017, belted slacks can be worn as an alternative.