Look in the mirror before you go to church. This will not be an exercise in vanity, because you know very well you are minimally groomed and dressed solely on the basis of what is both clean and fits. But still, look. See whether there is so much glurk or oatmeal on your top as to require a change. Make sure you have your skirt on. Make sure your pajama pants aren't still on under it. Check for squash seeds in your hair.
Do this with the light on, so that you will be able to tell if something that shouldn't be showing through is. See to it that snaps and hooks are snapped and hooked. If you have chosen to accessorize with a zipper, remember that they are most flattering when zipped.
I'm sorry to insult your intelligence, self, but we both know you've earned it.