Question: After Del Blaine finds out Jimmy isn't Clark Devlin why did she want his watch and shoes? I understand her wanting everything else but not the watch and shoes.
Question: Exactly what is Banning's plan?
Answer: If you're talking about his evil plan with the Banning Corporation, he wants to take over the world's drinking water supply (so that anyone who wants drinking water will have to buy it from Banning). He is trying to contaminate the U.S. drinking water with a deadly bacteria.
Chosen answer: Since Del knew that the tuxedo actually belonged to Clark, she most likely thought that the watch and shoes did too.