You searched for: “introversions
introversion (in' truh VUHR zhuhn, in' truh VUHR shuhn) (s) (noun), introversions (pl)
The folding in upon itself of fabric, paper, etc. to create a space or pocket into which to place something, usually that which is small: The clever tailor was able to create an invisible pocket by the introversion of cloth on the inside of the coat.