My prefix will shut you down,
my suffix a common noun.
My infix desirable to fit in a gown,
I am what you might find in a ghost town.
What am I?
Are you
nothing?
My prefix will shut you down,
NO
my suffix a common noun.
a THING
My infix desirable to fit in a gown,
THIN
I am what you might find in a ghost town.
You might find NOTHING in a ghost town.
I know there's already an accepted answer. I'd like to point out that another is possible that (to my mind) works almost exactly equally well.
It's
NOBODY
and its parts are
NO (same as for NOTHING), BOD (instead of THIN; a little too slangy for my taste but is indeed a desirable thing to fit into a gown), BODY (a common noun, about as much so as THING)
and of course
a ghost town contains NOBODY much more literally than it contains NOTHING (it presumably still has buildings, for instance; what makes it a ghost town is precisely the absence of (living) bodies.