This all-business look is definitely the most formal of the trio, but probably the easiest to assemble. With the casual and semi-casual looks, you've got to be a little creative in how to achieve the specific look you're aiming for. However, with this business look, all you've got to do is throw this topcoat over your suit, and you're good to go. Now, I must stress to you: if you're suit is not well tailored (i.e. cut slim), your sleeves are going to bunch, and the outfit is going to look clunky and forced rather than streamlined and natural. Also, be sure your topcoat is cut slim as well to avoid looking like a middle-class 90's dad.
Coat: Banana Republic | Suit: J.Crew | Shirt: H&M (similar here) | Pocket Square: The Tie Bar (similar) | Tie: Estuniga (just like this one) | Tie Bar: J.Crew (also dig this one) | Shoes: Suitsupply (just like these) | Watch: Daniel Wellington | Bag: Jack Spade (this one is great too) | Glasses: Warby Parker | Socks: J.Crew (also love these)