A crew-neck sweater and black sweatpants are wonderful menswear must-haves that will integrate really well within your current casual fashion mix. For something more on the off-duty side to round off your getup, complete this ensemble with a pair of black and white athletic shoes. When temps are dropping and autumn is in the air, you'll appreciate how great this look is for summer-to-fall weather. Relaxed outfits for young gentlemen aren't actually that hard, as you can see here.