I find YouLookFab's website a very good resource. A recent article on boots (YOU KNOW I LOVE BOOTS!!) you may like if you haven't already seen it:
Boots and Hemlines: Mind the Gap
Style guidelines often suggest leaving a gap of leg, skin or hosiery, between the top of tall boots and the hemline of your dress or skirt because the visual effect is more flattering. Of course, with on-trend longer hemlines, “the gap” is not achievable with tall boots. So what are we to do?
Read more at YouLookFab...