noun
wearable blanket
A blanket designed to be worn, often with sleeves, allowing freedom of movement while staying warm.
寒い冬の夜は、着る毛布を着てテレビを見るのが好きです。
On cold winter nights, I like to wear a wearable blanket and watch TV.
ひざ掛け is a lap blanket, typically used while sitting, whereas 着る毛布 is worn like a garment.
Compound of 着る (to wear) and 毛布 (blanket). A modern product name that has become a common term.