Most police departments issue a retention holster of some kind. The local police department in my city issues a Level 3 retention holster, which means three things must be done before the gun will come out. There is a thumb break that must be deactivated, then a button that must be pushed, then the gun must be tilted forward.
Badge, holster, boots...
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Yes they can wear something otherwise they will be naked.
Backwards; depends on who you are talking about. Cavalry; to make it easier to get to.
You slide your belt through the loop on the back and wear it on your belt.
Different departments wear different colored uniforms,
People wear Hawaiian shirt and a holster. People wear a hairpiece and hiking boots.
Police uniforms if they are in the uniformed branch or normal cloths if they are not.
Probably to look cool, I guess. But I guess there are lots of reasons why they wear those.
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50-350 USD or so
They wear a special clothing called "Adinkra Cloth" and there's a another name for it. it is called a "Talking Cloth".