I have collected some that I like here... I must warn you some of these are rather expensive (Burberry, Lanvin... ) however I collected them none-the-less. I assembled both espadrilles and black wedges. Some of these are dressier than others but they all share one thing in common. Refined.
After much (too much) searching I think I have settled on this one:
These will work with a FBD (Floaty Black Dress) or rolled up boyfriends. Done and done.