Do Leather pants on a guy look GAY

If they are too tight, then I guess the answer would be yes.

It depends on the type but in general it's true that it has that connotation.

I am not sure, leather was worn long ago even in the sixties by the Beatles.

Here is a fun article about leather in music history. 

Yes, If you wear them you'll look like a hippy

Yes, If you wear them you'll look like a hippy

Yes, If you wear them you'll look like a hippy

it totally depends. if you see a guy casually wearing loose fitting leather pants in a sweater, t/long sleeve shirt or even a hoodie, then of course no. on the other hand if u see a guy in tight pants (after that it doesn't even matter what else he's wearing) then yes, he looks about as gay as richard simmons.