I think I wear mine almost every day - I got these right before it started to rain and they're perfect - no, they don't look like leather, and I don't want them too - they're a great height (I'm 5'4" and they hit just below my knee) there's so much room in these that you worry it'll look weird with tights but not at all - you can wear these with pretty much everything - tights, jeans, leggins, whatever - my pants are easily tucked inside.

Go with the other suggestions and get these at your true size, even if you plan to wear them with thicker socks or want to put insoles in them like I did - they're very roomy in the foot to the point that if I were going to wear them as-is with tights and thin socks I'd have wanted just a half-size lower. I got my true size and wear them with everything and they fit great. I want some in ever color!