Is there some new kind of casual Friday I don't know about?

还有我不知道的星期五便装日？。

He decided to wear chinos for the casual Friday at work.

他决定在公司的休闲星期五穿卡其裤。

In many companies in the United States, they have casual Friday, and that's a day where you do not have to wear as nice of clothing.

美国很多公司都有周五便装日，那天你不必穿好看的衣服。