Formal navy-blue mess dress jacket featuring a short, squared back cut with pointed tails, a shawl-style collar faced with dark satin, and gold rank stripes on both sleeves. Each cuff bears three gold stripes with one thinner black stripe, indicating the rank of Lieutenant Commander in Commonwealth naval services.
The jacket has a single front closure (hook or button missing) and is lined in dark blue satin. No insignia, medals, or buttons are visible on the front panels in the current condition.