The elephants of the Sucessor had armor. In the book of John Warry about ancient warfare he says that the Ptolemies used armor for their African elephants so that they could have a chance against the bigger Indian elephants used by the Seleucids at Raphia.

What I am not sure its about the mahout (the elephant rider) using armor. I have always read that the elephant panicked when he lost his riders, but I am not sure how easy elephants lost their riders. You understand me?

Without protection they could easy be killed by a well placed javaline or arrow, but illustrations I have found dont show them with much protection. I hope people dont get angry but if it is for me, while having so many elephants and factions that use them, I vote for having elephants without armored mahouts and some elephants with armoured mahouts.

http://members.tripod.com/joseph_ber.../hydaspes4.gif

http://www.hobbybunker.com/images/products/2025a1.jpg

http://www.ancientbattles.com/indian...dian_EL_01.jpg

As you see its also a matter of interpretation as in the illustrations above there are 2 Indian elephants with unarmored riders, but there is one illustration that has a rider with a linothorax and a Greek helmet.