There's the movie, the Incredible Shrinking Pants and its rather less successful spin-off, The Incredible Staying-Exactly-The-Same-Size Pants which was a disastrous movie, but the idea was bought by Marvel Comics and following some character development resurfaced as The Incredible Hulk series.
From Somewhere In Pants: I'm all out of pants Crazy Pants Puppy Pants Don't Give Up On Pants I'm Not In Pants Could It Be I'm Falling In Pants and Without Pants to name but a few...
the Pantszone hits: Love Me For Pants A Picture of Pants Father and Pants (pinched from Cat Pants) And my personal favourite... The Key to My Pants I've just realised how sad I am...
Would also like to point out that Love Me For Pants was originally a hit for the Osmonds. Another pinched cover version (though not from the Osmonds) was of course So Take A Look At Me Pants, by Westpants and Mariah "My Girdle's Too Tight" Carey. Then there was 5ive's original hit, When The Pants Go Out.