In the early days, the streamer behind the ocean cap was mainly used for direction finding. Today, although modern meteorological equipment has been used, streamers are still in use and become a distinctive symbol of naval soldiers. As for shawls, they were mainly used as "shoulder pads" at that time. In order to prevent long hair from polluting the back of uniforms (sailors used to have long hair), it seems that it has no practical value except aesthetics today.
Living and fighting on the ship, sailors often have to go in and out of the narrow cabin, and their activities are restricted. Therefore, jackets are generally pullover-type, and the neckline is relatively tight. After wearing them, they must be plunged into the waistband to avoid worrying about clothes when going up and down the gangway and entering and leaving the hatch. The tops of marine uniforms are collarless and concave and convex at sea to avoid the collar irritating the throat and causing vomiting. Sailors' trousers are open to the side, which is convenient for sailors to climb the mast: they are wide open and breathable, easy to roll up when washing the deck, and can be quickly taken off when saving people at sea.