noun
waist cord for kimono; koshihimo
A soft cord tied around the waist under the obi to hold a kimono in place while dressing.
着物を着るときは、まず腰紐をしっかり結びます。
When putting on a kimono, first tie the koshihimo firmly.
Compound of 腰 (こし, 'waist') and 紐 (ひも, 'cord').