This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
襗 combines 衤 (clothing) with 睪, which likely contributes a phonetic element. The exact historical development is uncertain.
The left side 衤 suggests clothing, and the right side 睪 is a complex shape. Picture an elaborate garment with many folds and layers, but its exact purpose is unclear.
For タク, imagine a tack holding together the layers of this mysterious garment: tack -> タク, and the pin keeps the clothing in place.