If the cookie is on the floor for less than 5 seconds, can you still eat it?
Yes, depending on the floor.
My answer: Yes!
Now, if you'd laid everything out a week ago, maybe not....then there would have been plenty of time to re-think or iron this or wash that.
But FFBO I think is not defined by being put on while you are actually walking out to your car. The night before is fine. Of course like anything, we can have fun with definitions such as, "Most Extreme FFBO" .
I would also say, the more you hone your outfits and have mostly or only items that work well together or can remember what goes together, the more blurred the line between FFBO and just getting dressed.
So, I also agree with rachy--don't go too deep!
For me what tends to define FFBO is a simpler outfit, not too many moving parts even though for other people it might involve knowing exactly what accessories to grab, so could be fully accessorized but in a very "safe" way. Also it often errs on the side of comfort, coverage and action-worthiness. It might be something or some items I wore the same week or last week--the basic black pants or the gray sweater that goes with everything or more advanced to an outfit that is just repeated full-on without tinkering.