This pairing of a navy suit and a navy crew-neck t-shirt is a real lifesaver when you need to look on-trend in a flash. Feeling inventive? Switch up your ensemble with a pair of black leather tassel loafers. A wonderful example of practical fashion, this outfit must be in your front hall closet this winter season. As you turn 30, you want to start dressing in a more elegant manner. In this case, looks like this are a surefire option.