Yes, PEPLUMS is a Scrabble word!

Letter values in Scrabble US: P 3, E 1, P 3, L 1, U 1, M 3, S 1.

Is it a valid word?

PEPLUMS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

a flared ruffle attached to the waistline of a dress or jacket or blouse
a garment worn by women in ancient Greece; cloth caught at the shoulders and draped in folds to the waist