So I recently saw a man wearing a cape as part of a costume. I noticed that he had attached Tzitzis to the four corners of this cape.
It must be that tzitzis are required because it is a 4 cornered garment. On the other hand, he was already wearing a "talis koton" (garment with four corners worn to obigate the wearer in the mitzva of tzitzis.
My question is: Do you have to put Tzitzis on a cape if you are already wearing a "talis koton"?