Red shirt

[rebbonk]

There's a captain and his crew, and they always won naval battles. One day, a sailor called out "Cap'n! 10 ships approaching!"
The Captain replied "Get me my red shirt!"
They did, he put it on, and they won the battle.

Later, a sailor called "Cap'n! 20 ships!"
"Get me my red shirt!"
They did, and they won after he wore it

Later, 50 ships attacked, they got their captain his red shirt, and they won

Then one day a sailor asked "Captain, why do you wear that red shirt?"
"If I get shot and bleed, you won't see my blood and keep fighting for me" said the captain

Later...
Sailor: "Captain! 220000 ships!"
Captain: "What!?

Spoiler:

Get me my brown trousers!"