Yes, KAFTANS is a Scrabble word!

Letter values in Scrabble US: K 5, A 1, F 4, T 1, A 1, N 1, S 1.

Is it a valid word?

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

a woman's dress style that imitates the caftan cloaks worn by men in the Near East
a (cotton or silk) cloak with full sleeves and sash reaching down to the ankles; worn by men in the Levant