There's nothing more modern for night than mixing everyday and dressy pieces, like a regular sweater (dual-function items save money) over a long, festive skirt. Or work the masculine-feminine duality of the tuxedo, which is very popular this fall (the late, great Yves Saint Laurent pioneered the women's version). Always smart: casual basics in fancy fabrics (charmeuse, lace, metallics) that give you the comfort of a tee, tank, or drawstring pant while still looking party-ready.
The new reliables:
From top: Turtleneck: Ralph Lauren Black Label, $525
; Ball skirt: CH Carolina Herrera, $780
; Sparkly belt: Ann Taylor, $36
Tuxedo jacket: BCBG Max Azria, $318
; and shirt: Kate Hill; $68
; dressed down with jeans: Fidelity Denim, $188
Sequined tee: Cardigan: $695
; and silk skirt: CH Carolina Herrera, $430
Photos: Ben Goldstein/Studio D; Styling: Brenda Barr for Mark Edward Inc.