Describe the bare minimum of what they're wearing if it's practical knowledge. (I.E., it'll shield them from something or they'll hide something in it later, or it's relevant to who the person is.) One adjective for each article of clothing at most. If there's something particularly remarkable about them that you'd pick out at a glance, pick one or two things and then roll with it. Only describe things as they become important, don't set a paragraph aside in the middle of an otherwise reasonably flowing story to describe what the guy looks like. People don't care about that kind of thing anymore, unless they're CoGsuckers.