衿 —

衿を縫いつけた肌着はプルオーバータイプで袖は７分袖とする。

The undergarment with a collar sewn up is a pullover type and has three-quarter sleeves.

地衿 is also written 地襟.「共襟」とも書く。

Tomoeri

共衿 is also written 共襟.衿は襟と同じ意味。