Try teaming a white v-neck t-shirt with navy skinny jeans if you want to look casual and cool without putting in too much time. Go ahead and complement this getup with a pair of white canvas slip-on sneakers for an added touch of elegance. Off-duty ensembles for stylish 40-something men aren't actually that hard, as you can see here.
White V-neck T-shirt with White Canvas Slip-on Sneakers Outfits For Men After 40
A white v-neck t-shirt looks especially good when paired with grey sweatpants in a relaxed ensemble. You could perhaps get a little creative in the shoe department and add white canvas slip-on sneakers to the equation. Relaxed casual ensembles for gents in their forties aren't actually that hard, as you can see.