For an ensemble that's super easy but can be flaunted in a ton of different ways, pair a blue denim jacket with a black crew-neck t-shirt. Finishing with black leather loafers is an easy way to infuse a sense of class into this ensemble. Needless to say, it's easier to work through a warm warm weather afternoon in a easy and breezy outfit like this. This combination is probably exactly what you're looking for as a gent in his fifties.