First I wanted to say definitely coincidence, but after seeing the picture... the style of the hat is basically identical (although it's a very stereotypical pirate hat) with the eyepatch on the opposite side, and he is wearing a bandana as well. The people working on the show would have been familiar with the MLP product line, since they had to incorporate the toys into it, but then again the Big Brothers was no longer in production at the time...
So, while likely a coincidence, it's not completely crazy to think some thought might have been put into it.