This combination of a dark brown turtleneck and a navy turtleneck is hard proof that a safe off-duty outfit can still be really interesting. Finishing off with brown athletic shoes is an effective way to inject a dash of stylish casualness into your ensemble. If you feel uninspired by your autumn style options, this ensemble just might be the inspiration you are looking for. Those who wonder how to pull off cool casual looks as you move through your 20s, this getup should answer your question.