It could be a hole caused by normal wear and tear, or climbing over rocks in the Emyn Muil, with dirt around the edges. It doesn't necessarily have to be gotten in a battle. Remember, Frodo and Sam journeyed for a long time on foot. I have a feeling that their clothes didn't stay in pristine condition all the time.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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