Excellent choice — #7 of 31 Chiffon ranks #7 of 31 fabrics for night sweats. It is one of the best fabrics for this. Ranked on breathability and moisture absorption, penalised for warmth and weight. The top pick is Linen.
Chiffon measures 78/100 for breathability, 8% moisture regain, 20/100 warmth, at 50 gsm. For night sweats, high breathability and limited moisture absorption decide comfort — and its low warmth avoids trapping heat against the skin.