Refers to a pocket sewn on the inside of a garment, such as a jacket or coat.
I put my wallet in the inside pocket of my coat.
Standard kanji-kana mixed spelling for 'inside pocket'.
Alternate kanji spelling using 嚢 (pouch); less common.
Compound of 中 (naka, 'inside') + 衣 (koromo, 'garment') + くし (kushi, possibly from 串 'skewer' or a phonetic element). The exact derivation is uncertain.