Passenger deaths are minimized if the pilots only wear t-shirts and shorts. That way they will be less prone to fly the aircraft into the drink.
Or - less likely to
want to put it in the drink - even if that is the best course of action, as they aint gonna survive very long in shorts and t-shirt. This might bias the decision to ditch and cause them to try to push on to land, when in reality it may be the best option to put it in the drink.