Pirate captain's red shirt.

A man wanted to become a pirate so he joined a crew. Over time he ended up becoming first mate under an infamous captain. One evening a rival ship issued a challenge. The captain asked his first mate to grab his red shirt. He grabbed the shirt and they fought their rival and won. The next day two ships issued a challenge. The captain asked his first mate to grab his red shirt, they fought and won. A couple of days later five ships challenged this captain. He again asked his first mate to grab his red shirt, he did and they fought and won. The next day ten ships challenged them and again the captain asked for his red shirt. The first mate catching on to a sequence asked the captain "what's up with the shirt? No matter what we go against you always ask for it and we always win!" The captain replied "you see it's a physiological game. With the red shirt my crew can't see me bleed if I get injured and it helps with moral." The first mate understanding go's to grab the shirt and one again they are victorious. The next day, a huge armada came to face this crew, one hundred ships strong. Spooners and war-boats as far as the eye can see. The captain says to his first mate, "first mate go and grab my brown pants."