noun
hem (of skirt); train (of dress); cuff (of pants); foot (of mountain)
Primarily refers to the lower edge or hem of a skirt or dress, including the train. Also used for the cuff of pants and, metaphorically, the base of a mountain.
彼女は裳裾を引きずりながら歩いた。
She walked dragging the train of her dress.
山の裳裾に小さな村がある。
There is a small village at the foot of the mountain.
裾 is a more common and general word for the hem or lower part of clothing, or the foot of a mountain. 裳裾 is more specific to the hem or train of a skirt/dress and has a slightly more literary or elegant feel.
Compound of 裳 (mo, 'skirt' or 'ancient lower garment') and 裾 (suso, 'hem' or 'lower part'). The exact historical derivation is uncertain, but the combination naturally refers to the hem or train of a skirt.