A white crew-neck t-shirt and mustard chinos are stylish menswear pieces, without which no closet would be complete. Ramp up the formality of this ensemble a bit with a pair of dark brown suede loafers. As you're maturing from your 20s to your 30s, you want to start dressing maturely. If that's the case, combos like this are a safe bet.
Opt for a white crew-neck t-shirt and mustard chinos for a daily look that's full of charisma and character. Go ahead and introduce burgundy leather derby shoes to the equation for a sense of sophistication. This combination shows that dressing appropriately for your age and looking stylish are not mutually exclusive things.