depends on what you are calling "khakis"? The color, or are you referring to a "chino type" of pants? I personally do not often wear the color khaki, but I have many pairs of "chino types" of pants in various blues, grays and a couple blacks....all of which I would wear to a clam bake in the fall if the weather was chilly.
Many times if you looked at my pants you wouldnt call them "khakis", in fact, most on here would just think "That guy looks good" (while you lick your lips) and not even think about them. Under the radar, casual and fresh to death. My pants, if not work pants, are anything but formal.