Robe Malfunction

[gelite67]

No: HPFGUIDX 126126


OK, the subject is a little tongue-in-cheek but this really bugs me --
don't wizards/witches wear clothes under their robes?

In COS, Ron and Harry get larger robes and shoes when they take the 
Polyjuice Potion to change into Crabbe and Goyle, but nothing else.  
What about pants, shirts, and undies?

In OOP when Harry enters Snapes worst memory, James turns Snape 
upside down revealing his underwear.

In GOF, after the World Quidditch Match, when the Death Eaters are on 
the loose, Draco taunts Hermione that she'll be up in the air showing 
her knickers.

I don't get it!

Angie