A man in black

[Over the top]

What does a man in black mean?
Does it mean he wears black clothes? can I say a man in blue, a woman in green ...etc.
Thanks

 

[philadelphia]

Yes, it does. Have you ever watched the film Men in Black?

 

[philadelphia]

Your question reminds me of an idiom: eg 'You must likely be in the pink' (very healthy). That is a bit off-topic, good to know though