One of the most popular ways for a man to style out a red leather biker jacket is to marry it with a white crew-neck t-shirt in a laid-back look. For something more on the casual side to finish off your outfit, complete this look with a pair of red and black leather high top sneakers. Keep this ensemble in your front hall wardrobe when warmer days are here, and rest assured, you'll save time getting dressed on more than one morning. Wondering how to master casual looks as you mature into your 30s? This combo is a practical illustration.