A juban is underwear to be worn underneath a kimono, in order to protect the kimono from the wearer.
This one is meant to be used with furisodes, which is why the sleeves are so long.

Width: 131cm (51.5")
Length: 129cm (50.5")
Sleeves (top to bottom): 109cm (42.5")
Armpit to Armpit (back): 61cm (24")
Chest (along the back fold, excluding collar): 121cm (47.5")

Age:
Before 2002

Fabric Quality:
High quality silk, very smooth, very soft
C - Age stain dotting across the piece, but it's very light. Stains on the front of the left sleeve.