Amber & Blue Jean Friday

My company has a Dress Code and Personal Appearance clause on the employee handbook which states that it...

... currently maintains a “business casual” dress code. Employee dress and personal appearance should be in keeping with standards of good business taste, and should be consistent with the requirements of an individual employee’s work day. Employees are expected to use their best judgment in choosing business clothing that displays a neat and professional image. Management reserves the right to mandate or change attire expectations.

Despite the need for clarification and refinement of this policy in the past (no tube tops, spaghetti straps or flip flops), the office is a well dressed and net environment--

--Except on Fridays which are designated as Blue Jean Casual days. Whew. Do things cut loose on Fridays around here! No camel-colored wool pants. It's a regular casual fiesta of attire. I worry that it's discriminatory against other colors of jeans, though. And I wonder how blue jeans really do relate to productivity. Like, would I be posting this right now if I were wearing a suit?