How do you get dean pants on lbp2?

To unlock Dean pants in LittleBigPlanet 2, you need to complete the "The Great Adventure" level, which is part of the "The Muppet Movie" DLC. After finishing this level, you can find the Dean pants as a reward in your prize bubbles. Make sure to check your collection to equip them on your character. Enjoy customizing your Sackboy!