A garnment with nice cut-outs or a slit is always a good option to be sexy without showing too much. Demonstration below for a romantic dinner.
Skirt with a slit
Credits: Top: N12H / Skirt: Hotel Particulier / Shoes: Christian Louboutin
Layer on a sexy cut-out dress
Credits: Dress: Milo Maria / Coat: Hotel Particulier / Sandals: Prada / Over-the-knee boots: Steve Madden / Eyewear: Garrett Leight
Location: Santa Monica
Stylist and model: Julia Comil / Photographer: Nicolas Comil