m.topshop.com/en/tsuk/product/petite-drape-front-dress-5779849
Disclaimer: I'm short so it was maybe an inch or two above the knee, probably more like two actually. Certainly not as high as model though! I wore it with black flats and tan tights. I work in a bank and think I completely misjudged it - have been wearing it a lot recently though as don't have much workwear 😖