Conversation so far:
What role did Pierrot play in Shakespeare at the Funambules?
Pierrot murders an old-clothes man for garments to court a duchess.
Is Pierrot punished for the murder of the Old-clothes man?
Pierrot is then skewered in turn by the sword with which he stabbed the old-clothes man when the latter's ghost lures him into a dance at his wedding.

Question: Why did Pierrot commit the murder?
Self-contained rewrite: Why did Pierrot commit the murder of the old-clothes man?