The first is the collocation of professional clothes. If you used to choose a suit with colors such as gray or black, you can try to choose burgundy or plaid now, because a 30-year-old man will look more mature and steady after years of baptism, and wearing a burgundy or dark plaid suit will also give him extra points. It is best to wear a shirt or a thin sweater inside a suit, and never wear cotton and linen to look inferior.
Then there is casual wear. When you go out for leisure, you'd better wear more textured clothes. For example, an inch shirt with jeans will also make you look particularly young and energetic. It would be better to wear a backpack or casual shoes.