noun
stacking permanent wave; stack perm
Abbreviation of 'stacking permanent wave', a hairstyle with layered curls. Used in beauty and fashion contexts.
彼女はスタックパーマをかけて、髪にボリュームを出した。
She got a stack perm to add volume to her hair.
General term for permanent wave; スタックパーマ specifies a layered, stacked style.
From English 'stacking permanent wave', abbreviated in Japanese.