Irrefutable proof that a long sleeve t-shirt and navy chinos look amazing when worn together in an off-duty menswear style. A pair of slip-on sneakers looks perfect finishing off your look.
Long Sleeve T-Shirt with Slip-on Sneakers Smart Casual Outfits For Men
So as you can see, looking casually sleek doesn't take that much effort. Team a long sleeve t-shirt with a beige linen suit and you'll look awesome. Slip-on sneakers will bring a more relaxed finish to an otherwise standard look.