A beige crew-neck t-shirt and dress pants are absolute must-haves if you're planning a semi-casual wardrobe that holds to the highest menswear standards. To add a dose of stylish casualness to your ensemble, complement this outfit with black athletic shoes. So as you can see, it's extremely easy to look awesome and stay comfy come fall, thanks to this outfit. As you see here, as a 30-something, you have a vast array of dressing options.