Referring to groups of people


If I was to refer to people who like fish, I'd say something like 「魚が好きな人」,
but if I was to refer to people who do something, how would I go about saying
that? Would the format be similar, or would it be completely different. I know
in Japanese, to like is treated as an adjective, where as, someone doing
something would be a verb, so if I was to refer to people who wear pants,
would I say it as something like this 「ズボンを履いている人」? I'm not sure if I'd use
the TE form of the verb, or if I'd have to use a different form, nor am I sure
if I need to use いる or ある. I went with いる, as I'm referring to a live, animate
person, but I'm not even sure if I'm even remotely close to saying it
properly. Is there some other particle I'd need to use, or a different
sentence structure? Or would referring to a group of people based on something
they do, such as people who wear something, people who exercise, or certain
actions be unnatural in Japanese?

