This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
帍 combines 户 (door) and 巾 (cloth). The exact historical development is uncertain, but it likely originally referred to a cloth hung at a door or a type of curtain.
A cloth 巾 hanging from a door 户, like a curtain or a banner. Its meaning is unclear, but the shape suggests something related to fabric and an opening.
For コ, imagine a small cloth 巾 hanging on a door 户, and a child (子, こ) peeking through it: 子 -> コ.