... starting a new job next month in an office; any tips on proper dress? I've had to wear business clothing before and stuck to black/navy suits; however I don't really have much in terms of 'style', so when it comes to matching a sport coat with a pair of dress pants, I pretty much don't have a clue on what to buy

Don't even want to worry about socks and shoes; I have about a dozen dress shirts so I think I'll be okay in that department
I also don't really know what's appropriate when it's 25 degrees outside... any tips from the 'Business Clothing for Dummies' book?