This modern casual pairing of a grey crew-neck t-shirt and blue jeans is extremely easy to put together in next to no time, helping you look seriously stylish and prepared for anything without spending a ton of time digging through your wardrobe. You could perhaps get a little creative in the footwear department and dial down your ensemble by rounding off with a pair of navy and red athletic shoes. Those who are curious how to sport modern off-duty outfits as you move through your 20s, this combination should answer your question.