I also thought that somehow Fatty got into Frodo's clothes & wore them about so that people would think Frodo was still there (albiet much fatter on a supposedly tighter budget). Although Eomer of the Rohirrim brought up a good point, about the Blackriders probably not knowing that they were Frodo's clothes anyway. Perhaps they just figured the Riders would go by what they heard from the hobbits around there, or maybe it was just something that the conspiritors thought would be a good touch.
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