This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 衻 is uncertain. It visually combines the clothing radical 衤 with the component 冄, but the original semantic and phonetic roles are unclear.
The left side 衤 suggests clothing, and the right side 冄 is a rare shape. Without a clear meaning, picture an ancient garment whose name has been forgotten.
For ネン, imagine a tailor named Nen carefully hemming the edge of a robe: Nen -> ネン, and the clothing radical 衤 ties it to fabric.