While SCUBA diving you are wearing a fabric vest that is known as your boucency compensator or your B.C. This also happens to be the vest that keeps your tank attached to your back. When you wish to float to the surface, you slowly put air (from your tank) into your BC. The air released in the vest is much less dense than the water and thus it travels to the surface pulling you with it.
By putting additional air in the buoyancy compensator (BC) vest.
black vest
that would be an amo vest
Air tank, regulator, depth guage, form of time keeping, compass, either charts or a computer to tell you how long you can stay down before the decompression limit, bcd (inflatible vest), fins, goggles, weight belt and weights, optionals are gloves & dive knife & booties (protect your feet from being cut by your fins) & wet suite & dry suite & snorcle.
Have a decent amount of weights, or dump the air from the vest. Vice versa for staying on the surface.
An Investigator!
The American usage of the word of "vest" is called "eine Weste" or "ein Unterjäckchen".The British usage of the word of "vest" is called "ein Unterhemd" or "ein Leibchen".
Vest
The purpose of a running vest is to keep the runner warm well also providing little to no restriction on the arms. It was designed to offer full movement of the arms well running well keeping your core warm and insulated.
they are called tank vest
a vest or a body warmer