He wears the standard high collared, full body uniform of the Konoha medical ninja.
As a medical-nin, Kusushi presumably has a high level of intellect, is well-versed in medical ninjutsu, and has excellent chakra control to perform medical procedures.
Sasuke Retrieval Arc
He, along with a team of medical ninja are sent as medical support to the Sasuke Retrieval Team. He meets Kakashi Hatake while he is returning to the village with Naruto and informs them of the condition of the other team members.