Noah Z. Jones has created a ridiculous menagerie of animals in their underpants.
He's has also made a few available as papercraft downloads, including this Narwhal I put together.
You can buy t-shirts and mugs with the designs here. He's also created several silly monsters. And illustrated several books available at Amazon. Alas, no stuffed animals.
*Previously: Piranha Plant underwear; Boy puts out fire using aunt's giant underwear; Costco recalls punching bags filled with underwear.
*Buy "sexy underwear" at Amazon. Careful, some of these things you won't be able to unsee.