I love the Country Road brown suede flat over-the-knee boots, in fact most of the styles I have chosen are flat. I think if you want to minimize the 'streetwalker' look then low heels as opposed to high are the way to go. All of these boots would work well with leggings and/or jeans and a tunic top or chunky jumper, as well as styled with dresses. See the photos below, and check out my Pinterest page for more outfit ideas.
All photos from Pinterest.