Emperor's ceremonial robe, Korozen-no gohoh.
Explanation

1.ryuei-no on-kanmuri
a. kake okobineri
2.on-hitoe
3.korozen-no go-ho
4.on-shitagasane-no kyo
5.on-shaku
6.on-hiohgi
7.on-tatoh
8.on-ueno-hakama
9.on-ohguchi
10.on-sohkai
11.on-sekitai-no uwade
12.on-sekitai