The vast majority of my wardrobe of made up of such pieces, that I can pull out (or pick up off the floor!) and make a decent outfit of with almost zero effort. I think the key to this kind of dressing is to buy quality pieces that are stylish and so comfortable that you can't help but not pull them on at any given chance.
For me, the formula I follow is a pair of leather pants (or a skirt with tights), ankle boots (always leather), a knitted top (wool blend, usually) and a big ol' coat. It's nothing new, really - my friend Crystal from Denchibitionist turned up wearing the same thing - but it works!
I'm wearing: H&M coat // Camilla & Marc leather pants // Shubar boots // Opening Ceremony top // Sophie Bille Brahe 'Elipse' earring