Wearing a suit is armor of modern gentleman, as well as a manifestation of masculine taste and style. Different people, different scenes and different uses have different ways of wearing formal wear.
Fitness is definitely key to wearing a suit. Whether you make clothes to order or buy ready-made clothes, you need to consider following points:
Shoulders. The shoulders of blazer should remain smooth where arms naturally hang down.
Pants Length: Some people like to cover their toes and others like cropped pants to show off their ankles, it's a matter of personal preference. But generally speaking, cuffs of your trousers should fit snugly against your shoes, not be too long or wrinkled.
Sleeve length: The cuffs of shirt should exceed length of jacket by 1-2 cm, in order to better change proportions of human body.
In addition, we need to understand:
What costume should we wear for what occasion.
Three-piece suit: top, pants and vest. A three-piece suit is more formal than a two-piece suit. Therefore, when participating in high-level business events, you can wear it like this. Such as high class forums, award presentations, meetings with dignitaries, etc.