I really have doubts that you don't know how to wear a black coat. It seems to be one of the most versatile parts of our warm wardrobe, so it suits all the types of clothes. Personally my fave looks are total black or black+gray+white looks, combos with jeans etc. Which one look is your fave?
My Russian post about black coats with some style advises (you can use a translator): C чем носить черное пальто? Oh, gosh, when I will have time to write such big posts in English? I barely have time to post these pics =)