One of the options I often use when dressing up is adding a statement shoe to punctuate the look. I tend to wear more minimalist clothing so the unexpected pop of sparkle or color elevates a more subdued look. Luisaviaroma posted this Mach & Mach mule which is pretty exceptional.
I also love the Gucci GG Slingback. When I first spied them, it was love at first site. I tried them on in the store a woman asked me what I plan on wearing them with. Everything! The shoe will start the outfit. A little over the top perhaps, but this look goes along with my current mood of taking a detour from dressing down the last year and a half.