double-woven obi
A formal obi with a bag-like construction, often used with kimono for special occasions.
結婚式には袋帯を締めていきます。
I will wear a double-woven obi to the wedding.
Compound of 袋 (ふくろ, 'bag') and 帯 (おび, 'obi'), referring to the bag-like construction of the obi.