This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
褍 combines 衤 (clothing) with 耑, which likely contributes sound. The exact historical development is uncertain.
The clothing radical 衤 suggests something related to garments, but the overall meaning is unclear. Imagine a mysterious robe with an unknown purpose.
For タン, picture a tan-colored robe: tan -> タン, matching the clothing radical.