Board Thread:General Discussion/@comment-27973159-20160314042517/@comment-27799149-20160316180630

Well Mayuri stated that he designed his own Zanpakuto, so he can rebuild it aslong as he still has the hilt. As for his wardrobe, he is a mad scientist who likes to experiment so maybe that translates to his cloths aswell.

Sajin bankai's new form really isn't any different from his normal form, while Sajin is in his human state he is immortal so because his Bankai has a connection to him unlike other bankais, his bankai sheds its armor just like Sajin sheds his werewolf form and in the process becomes  invulnerable to physical harm almost like Sajin. They didn't have to discuss it because symbiotic connection already.