Turret Awning
Ironclad warship were infamously hot, both because of their metal construction and because, compared to traditional wooden-hulled vessels, they were very poorly ventilated. It was said that Monitor‘s galley reached a temperature of 150° F at times. As a result, most of the crew off-watch spent as much time as possible out on deck, and canvas awnings were set up whenever circumstances allowed.
Therer renders are of the awning fitted to Monitor‘s turret.
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Dark wooden decks were hot enough, though sailors of the wooden world often went barefoot. Ironclads eliminated that practice, I imagine.