A biker boot should be leather, though suede does make a good alternative, and adorned with a chunky strap which fastens at the ankle or, on some styles, below the knee. Steer clear of boots that are too shiny or too dainty this is not a lady-like look. An ankle-length pair will look great with thick tights and a sloppy sweater dress or worn over a pair of jeans. If your wardrobe is still packed with tea dresses from last season, opt for knee-high to update the summer's girly trend. Miu Miu do a gorgeous knee-length pair though more affordable versions are available at Office and from Kurt Geiger.