There are very many old companies that are out there that have all learned their lessons and have all decided to create dress codes for all employees to follow.
This would simply be a thing that would be as is, regardless of the weather found to be outside.
In the winter, if it is that one may need more clothes, it would only make sense for one to go ahead and wear some more clothes.
Yet, if it is summer time and a person is feeling the sun's stinging rays, they should not ever expect to be allowed to show skin; probably at the beach, but certainly not at the office.
Link: Wearing The Appropriate Clothes In The Office (office d