くつした靴下kutsushitaくつkutsuしたshita
1.

A clothing item worn directly on the feet, designed primarily to protect or insulate the skin while wearing shoes; typically made of fabric and can vary in thickness and style.

2.

An article of clothing that covers the feet and is often used for warmth or comfort, available in various lengths and materials, including light, thin options like stockings.

3.

A type of apparel that acts as a barrier between the foot and footwear, often serving both functional and aesthetic purposes, bringing added comfort and style to one's outfit.

Example:

この靴下の片方はどこだ。