These trousers looks like flanell trousers. If thats correct, they do very well at winter. Flanell is a popular winter fabric due to it's functionality at the colder season.
Coat: be honest, coats are built to last. So are a lot of undies, but unless you're a beast outdoors (and spend a lot of time in thorny thickets), your coat will definitely last many more years than smalls are supposed to.
Casual and stylish — Navy Jeans — Brown Leather Belt — Brown Leather Brogues — Burgundy Paisley Pocket Square — Burgundy Tie — Beige Blazer (think Trumaker Mitani) — White and Navy Gingham Dress Shirt (think Trumaker Whitney)
I dont normally like these jackets but this one looks good. Every business man needs a definitive sports jacket. Checkered blue jacket with a small yet eye-catching lapel pin (in maroon, no less) works wonder with in an otherwise plain blue/grey ensemble.