Dress in a black suit and a white crew-neck t-shirt if you seek to look seriously stylish without exerting much effort. You could go down a classier route in the shoe department by wearing derby shoes. A no-brainer getup appropriate for guys in their 20s who like to dress more elegantly.
This combination of a black suit and a white and black vertical striped dress shirt couldn't possibly come across as anything other than ridiculously stylish and sophisticated. Complement this look with derby shoes and you're all set looking killer. As you're transitioning from your 20s to your 30s, you probably want to start dressing in a classier manner. That's when inspiration like this comes in useful.
This combination of a black suit and a white dress shirt is the picture of rugged elegance. Up the cool of this outfit by rounding off with derby shoes. This ensemble illustrates that looking stylish at 20 is not particularly hard.
Dress for success in a black suit and a camel overcoat. Add derby shoes to the mix to instantly kick up the cool of your getup. A wonderful example for any gent who's working out how to dress as a gent in his 20s.
Go for a black suit and a light blue short sleeve shirt for extra stylish attire. Derby shoes will inject a touch of polish into an otherwise mostly casual look. You can pay attention to combinations like this if you're making it through your mid-20s and you want to take a more adult direction in your style.