For a casually dapper look, choose a navy crew-neck sweater and a white crew-neck t-shirt — these items fit beautifully together. If you need to easily level up this look with a pair of shoes, why not complete your outfit with a pair of dark brown leather loafers? Spring is a beautiful time of year and it calls for standout outfits just like this one. And if we're talking outfit ideas for gents over 40, this getup looks great on most gents.