When we run out of them upstairs, I've been known to appropriate some from our greenroom, pocketing a few with one hand as I smile and greet our guests with the other. One time, Dave Zinczenko of 'Eat this, Not That!' fame, busted me in the act. The cookies apparently fall in the 'not that' category. I made a note of it.
The Oval Office symbolizes... the Constitution, the hopes and dreams, and I'm going to say democracy. And when you have a dress code in the Supreme Court and a dress code on the floor of the Senate, floor of the House, I think it's appropriate to have an expectation that there will be a dress code that respects the office of the President.