IIRC, from my days when I had uniforms, a Bridge Coat is something for one of the more formal uniforms. It went along with "Service Dress Blues," which is the uniform with the white shirt, tie and jacket (like one for a suit). Pea coats went with the uniform like the one on top: http://buperscd.technology.navy.mil/bup_updt/508/unireg/Chapter3/Enlisted/em_13_Wk_WinterBlue.htm