C&A won the business after a four-way pitch, in which it beat incumbent agency of three years, Freud Communications.
C&A will support a major Impulse marcoms push early next year surrounding a new fragrance, with consumer PR supporting a major ad campaign that will target women in their teens and 20s.
The new fragrance - Siren - will be in stores next month.
C&A deputy MD Charlotte Clarke heads a five-strong account team, reporting to LF's Impulse brand activation manager Kay Dickinson.
Last month C&A lost a two-way pitch for LF's fabric conditioner brand Comfort to Cow Communications (PRWeek, 29 November).
However, it continues to handle PR for LF's Sure, Timotei, Vaseline Intensive Care and Non-Bio Persil brands.