This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
褠 combines 衤 (clothing) with 冓, which likely contributes the sound. The exact historical development is uncertain.
The left side 衤 suggests clothing, and the right side 冓 looks like stacked shelves. Imagine a garment folded neatly on a shelf, but its exact purpose is unclear.
For コウ, picture a coat hanging on the shelf: coat -> コウ, and the clothing radical 衤 reinforces the garment image.