I did a personal survival course at school, and it is difficult to float for a long time. You can take off your trousers and tie a knot in the leg ends, then put your arms into the legs, invert the trousers and ram downwards into the water to create a float. Even so, as clothes get heavier with water, you will tire, and relax, possibly get cramp, and as your body relaxes, it shuts down slowly to keep your core warm enough to survive. People either die in the first panic, or go to sleep with cold and exhaustion, and drown as the body loses its will to live.
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