A friend told me this story a few years back. They had just had a carribean layover and both he and the second pilot had gotten sunburned. As it was quite uncomfortable with the uniform against the red skin they both stripped down to thier skivvies. The lead flight attendant came up to offer some drinks and condolences, but when she returned to the cabin, she grabbed thier uniforms and high tailed it out of the cockpit. For the rest of the flight she had quite a laugh with them over thier onboard interphone. Just before landing she did bring the clothes back up to them.. No one arrested for streaking the cockpit. I guess it is a different time now. But the story gave me a good laugh.