I guess class and decorum is beyond their grasp as well.
They know they will be photographed, yet dress like that for travels on a taxpayer funded aircraft. As you pointed out, class and decorum is beyond their grasp.
After looking at that photo I have to look at this one to remind me what is just around the corner:
I have no idea why the first lady dresses that way in public
Just another "in your face" tactic by our betters.