Eli-ism

Background: Yesterday Eliana and Bracha were sharing a bag of melted ice cream chocolate treats. I have a video I'll upload. Of course they both got horribly messy and, having passed out on the train ride home after not napping all day, we brought them up to bed as is so they slept in their chocolately clothes. But before falling asleep we put long sleeved shirts on the because it got cool in the evening. So this morning Bracha got dressed in clean clothes and I tried to get Eli dressed, too.

Me: Eli, let's change your clothes.
Eli: No.
Me: But Eli, look, there's chocolate all over your pants. They're all messy.
Eli: Okay, but just the pants.
Me: We have to change your underwear, too.
Eli: But they're not dirty.
Me: Yes they are, you wore them all day yesterday, and each day we put on a fresh pair of underwear.
Eli: Okay, but not my shirt.
Me: But Eli, you got ice cream all over your shirt, too.
Eli: On my green [short sleeved] shirt.
Me: Yes, so it's dirty, so let's change it.
Eli: But that's why I have this [clean, long sleeved] shirt on top of it!

How do I argue with that logic?