Looks like someone missed context in writing the article.
They take care of their staff, as evidenced by Part C of Pg 12. Cellphone seems to be on company dime, as well. I get that there are standards, but, being Part 91, their ball, their rules.
They provide a uniform to the employees, which, just guessing, is at no expense to them, as it is stated "PROVIDED".
The boxer briefs aren't REQUIRED, they're PROVIDED. Is your employer providing your underwear to you? I'm not seeing a morning jock inspection, here. I'm seeing the company providing a uniform, in entirety.
There's more, but what it comes down to is that the Principals of the company expect that the crew provide a top notch service to the passengers of their $50MM jet. They want the image of their company represented in the highest possible light, and have spared no expense to ensure that it happens. And, it seems that they do a reasonably good job taking care of the staff.
Final thought; what does this document have to do with an age discrimination case? Can age discrimination be determined by this document?