This decorative cord is called 'wasure-o' (a narrow decorative strap used for hanpi garment), which is made with ra (loosely woven sheer silk fabric like net) of 3m65.8cm length and 10cm width.
この飾り紐は「忘れ緒」と呼ばれるもので、羅（ら/網を連想させるような目の粗い薄絹）で長さ一丈二尺、幅三寸三分の帯形に作る。