collar lining; lining of the collar
Refers to the inner fabric layer of a garment's collar, often a different material or color. Used in clothing contexts.
This jacket uses a smooth fabric for the collar lining.
Variant using 衿, which also means collar; less common but still seen.
Compound of 襟 (えり, 'collar') and 裏 (うら, 'lining, back side').