This edgy combination of a navy horizontal striped crew-neck t-shirt and navy jeans is extremely versatile and up for whatever the day throws at you. Hesitant about how to round off your outfit? Finish off with black leather derby shoes to amp it up a notch. As you're moving from your 20s to your 30s, you probably want to start dressing more professionally. If that's the case, inspo like this is very useful.