First: short-sleeved shirts are not formal clothes.
In the prevailing dress etiquette, short-sleeved shirts are not formal clothes. Don't wear short-sleeved shirts in any business and formal occasions. Some people even say that "there is no such thing as a short-sleeved dress shirt, only an unfinished long-sleeved dress shirt".
Short-sleeved shirts can only exist as "casual clothes" in most cases. Moreover, even in leisure situations, it is very difficult to put on a short-sleeved shirt. Compared with ordinary long-sleeved shirts, it is more attractive and needs to be tailored.
So:
Don't wear a short-sleeved shirt with a suit.
Don't wear a short sleeve shirt and tie.
Don't stuff short-sleeved shirts into your pants.
Business-style short-sleeved shirts are not only informal, but also ugly. If you don't believe me, go to Baidu pictures and search for "short-sleeved shirts".
If the weather is really hot, you can walk over and see how elegant the shirt sleeves are.
Second: Speaking of uniforms, short-sleeved shirts can be dressed formally, such as wearing a tie.
When it exists as a uniform or work clothes, sometimes a short-sleeved shirt can be formal and even a tie can be worn.
Short-sleeved shirts appeared as tooling from the beginning. Ordinary short-sleeved shirts were originally made by factories for blue-collar workers in summer in the early days of rapid economic development in the United States. Therefore, "short-sleeved shirts" are adopted as uniforms by many public institutions, such as the uniforms of some state police in the United States, the uniforms of NASA, and employees of some companies.
In other words, it is also a reminder: don't wear short-sleeved shirts as formal clothes unless the professional requirements or company regulations.
Third: How to make short-sleeved shirts look casual and elegant, and not vulgar, colors and patterns are very important.
If you are not a fashion expert, try to avoid red or purple, which are difficult to match. No matter what color you choose, remember that it needs to coordinate with the colors of other clothes on your body.
As for patterns and patterns, it's a bit troublesome. If you are a novice, try to choose only the repetition of a single pattern, such as dots, stripes or squares. Try to avoid choosing too fancy patterns. "Choosing the right pattern" is an advanced skill of clothing collocation, and it goes without saying too much here. Remember to choose a safer color that suits your skin color.
Fourth: Fit is very important, more important than ordinary shirts.