I think they've done this a few times. This time it happened in Superman #18. Clark took off his outer clothes showing everyone he's Superman. He made a big speech saying he wanted the truth to be out there. Seems like a dumb and overdone story idea to me,but I'll keep reading anyway.

"My friends have always been the best of me." -Doctor Who

"Well,whenever I'm confused,I just check my underwear. It holds most answers to life's questions." Abe Simpson

I can tell by the position of the sun in the sky, that is time for us to go. Until next time, I am Lothar of the Hill People!