A grey turtleneck and navy jeans are great menswear pieces to have in your casual box. For something more on the casual and cool end to complement this look, introduce a pair of green-yellow athletic shoes to this outfit. Can you see how very easy it is to look sharp and stay cozy when cooler weather hits, all thanks to getups like this one? Just because you've passed the big five-oh, doesn't mean you can't dress fashionably, and this combo illustrates exactly that.