A formal dress must go with a shirt. If you only wear a shirt and don't wear a suit, you don't have to wear a tie, but if you want to wear a shirt and a suit, you must wear a tie, otherwise it will be informal. Wear a western-style white shirt without a tie-because wearing a western-style white shirt is the most formal way to wear it. If you don't wear a tie, it will give people a very casual and sloppy feeling. Moreover, the white shirt has no pattern and is monotonous, which always makes people feel less. If you really don't want to wear a tie or really don't have time, you can have three choices: a. Put on a white shirt with a wide collar and turn the general out, and the fashionable look will come out, but you have to choose a dark suit to wear outside; B. You can wear a dark shirt, with stripes or plaids as the first choice, which will not make people feel monotonous, but also have a slimming effect; C. turtleneck pullovers are the safest accessories for suits. It has many colors and is easy to match. I can try 3qu.