A blazer and a grey crew-neck t-shirt are absolute menswear essentials that will integrate really well within your off-duty collection. And if you need to effortlessly dial down this outfit with a pair of shoes, introduce a pair of grey athletic shoes to your look. While dressing for the winter season can be a bit daunting, outfits like this one make you feel excited. And if we're talking casual fashion for 20-something guys, this ensemble looks great on most.