What would happen if you wore a black overcoat, black shirt, tight black jeans and black boots in the Caribbean?

Including on a sandy beach. And in summer.

There are definitely some people, my mother included, who would dress like that everywhere.

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Well, this is how Continental soldiers and sailors dressed in battle, even in very hot days.
What would happen if you wore a black overcoat, black shirt, tight black jeans and black boots in the Caribbean?
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