One trend that has grown on me is the over knee boots. I wasn't to into it when we started seeing them on the french Vogue editors a few years back, paired with slouchy Isabel Marant blazers, grey denim or short black minis. 
However, I then realised what a perfect fall shoe this is. You can still wear all your dresses and skirts, and still keep warm and look super chic! With that said, the over knee boots are a wardrobe staple for fall. Invest in a classic black suede pair, with or without a heel.