SO6P + Kurama = Naruto Bijuu Mode cloak.
When SO6P knew his time is running short.
Using his "Creation of All Things" he then separate the Ten-Tails and divide into 9 Bijuu.
He used the number of tails each Bijuu had, to made the difference.
The last Bijuu, (Kyubi or Kurama) he included some of his own chakra.
He did this so that whoever had control Kurama, then also could have to power to control the Ten-Tails like himself.
When Naruto (with his mom, Kushina, help) finally completed the transformation.
So, when Naruto changed into BM, he had the SO6P cloak.
When SO6P knew his time is running short.
Using his "Creation of All Things" he then separate the Ten-Tails and divide into 9 Bijuu.
He used the number of tails each Bijuu had, to made the difference.
The last Bijuu, (Kyubi or Kurama) he included some of his own chakra.
He did this so that whoever had control Kurama, then also could have to power to control the Ten-Tails like himself.
When Naruto (with his mom, Kushina, help) finally completed the transformation.
So, when Naruto changed into BM, he had the SO6P cloak.