Halloween costume: is it illegal?

is it illegal to wear real SWAT team uniform from other country (not USA) during Halloween?
is it illegal to wear real SWAT uniform from other country (not USA) on Halloween party? I'm borrowing my friend's uniform. No weapon No gun! Just the outfit for party only!
is it illegal to wear real SWAT uniform from other country (not USA) on Halloween party? i'm borrowing my friend's uniform. No weapon No gun! Just the outfit for the party only. I'm in California.

i'm not sure but i think that it's not legal. just because people might think you're a real officer.

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