another option to the gladiator sandal, I like

"black knee high caged flat gladiator sandals. made of animal friendly man-made leather. each buckle is adjustable to fit your calf (super skinny legs will have to poke a few new holes). zipper closure for quick dressing. very comfortable. rubber sole to minimize sandal slippage. and look, hannah's favorite olsen twin, mary kate (or ashley?) is wearing a similar, more expensive pair." (via Bona Drag)