I wear my hose 3 finger's width below the bone you feel on the outside of your leg below the knee (lateral tibial condyle). I wear my flashes so that the medial edge would "split the diamond" if I were wearing diced or Argyll hose, even if I'm wearing solid color hose; in other words; the inside edge of my flashes line up with an imaginary center line of my leg with solid color hose, and a very real center line with diced or Argyll hose. How far back the lateral edges of the flashes go I couldn't care less.