The store is having big sale for jeans and Jeff seems to be into the style of wearing them, but Muffy will only wear the fashionable ""Mr. Mouster's"" jeans, but the store hasn't ordered any. She is even more upset when she learns that her cousin Mort is coming for a visit and Muffy thinks he won't play with her if she isn't wearing Mr. Mouster's jeans. But Mrs. Pennypacker and the other try and convince her that ""It's what's inside that counts."" Later on, the director of Mr. Mouster's jeans commercial comes to the store and wants to use Muffy, Jodie, Sam and Jim. I mean Jeff in his commercial, until he has a look at Mort's new jeans that may put Mr. Mouster out of style.