Are sailors🚢⚓ supposed to wear top hats and have mutton chop sideburns?

Why do they wear white uniforms, and are clean shaven?

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In 1812, top hats, collared shirts, striped t-shirts, long sideburns, full heads of hair... this was the Navy look.
Are sailors🚢⚓ supposed to wear top hats and have mutton chop sideburns?
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