Here in the Phoenix area it reaches 105 degrees during the day. In addition, the dress code is much more informal than in other areas of the country. As you might imagine shorts are very common.
In many tropical climates, folks wear shorts as a matter of course.
Is it OK to wear shorts to mass in Hawaii?
In earlier time periods, people dressed up whenever they went out of the house. Of course, they didn’t leave the house as often as we do today. My 95 year old grandmother won’t leave the house without dressing up, even for informal trips into town. Many older people are this way.
In the early church, they had a different style of dress. Fifty years from now we may all be wearing Star Trek like suits.
This is a simply a matter of culture and circumstance. Of course, we must adhere to moral principles such as modesty, humility, respect, and subjection to proper authority. But, if such norms are not being violated we shouldn’t make a big deal out of this.