This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
裓 combines the clothing radical 衤 with 戒, but the exact historical development and original meaning are uncertain.
The clothing radical 衤 suggests something related to garments, but the overall meaning is unclear. Think of it as a mysterious piece of clothing.
For コク, imagine a coat with a mysterious tag that says 'KOK': the coat cues the clothing radical, and 'KOK' cues コク.