Nothing

You feel particularly lazy today and decide it's not worth the effort to go look through your clothes and pick out an outfit to wear today. So, a great idea hits you: you decide you'll just wear your birthday suit today.

You always hated all the work it takes to get dressed. Besides, in addition to being lazy, you're also bored and this should spice things up a bit. If you get in trouble it's not like you have any life ambitions you'd be throwing away. You don't plan to get a job and you don't care if you get thrown out of school. There are no consequences as far as you can think of, not that you thought all that much about it. You function more on impulse than careful thought, as made apparent by the outfit you've chosen for today.

And so, you set off to do your obligations for today, naked as the day you were born.