Introducing One Item, Four Ways

So it made me laugh that Dr. P (hello!) commented on yesterday's post that I should have a feature where I build different outfits around one piece. I laughed because I've been wanting to do this for a while and now we have One Item, Four Ways.
One item goes formal, office, weekend, and late night.
So here we go.
I chose this beautiful top by 3.1 Phillip Lim as the "investment piece" and tried to coordinate reasonably priced items to go with it. Some items (like black heels) you may already have.
FORMAL