["Once I put my shirt on inside out by accident. I didn't realize it until someone told me at school.", "That's hilarious!  Did you try to play it off like you meant to do that?", "No I'm not that hip. I felt kind of dumb and made some excuse about being in a hurry."]
Well, at least you were honest about it.  I bet you will never put your shirt on inside out again!  So, consider it a lesson learned!
One time I was wearing my shirt inside out. I didn't notice until I got to school and someone made a comment. I felt so dumb!