A shearling jacket and a crew-neck t-shirt are essential in any modern gent's functional casual collection. The whole outfit comes together when you complement your ensemble with a pair of dark green suede low top sneakers. As you can see, it's super easy to look awesome and stay comfy when fall arrives, all thanks to outfits like this one. And if we're talking casual outfit ideas for gents in their forties, this outfit looks great on almost any man.