Kate Middleton (Getty, Bauer Griffin)

A Grecian gown is a timeless evening style that promises to suit every body type with ethereal draping, airy fabric and floor-sweeping layers. The likes of Frieda Pinto and Emma Stone have embraced the delicate pleats and loose silhouettes emblematic of the elegant aesthetic.

Kate Middleton has refined her signature style with the classic dress, and suitably so, as the enduring design is both modest and flattering, portraying a graceful femininity intermixed with a powerful element of regality. Perhaps Kate took cues from Jackie O's memorable Halston pieces to refine her own impactful aesthetic. Never will you see Kate in a sultry form-fitting satin gown—leave the provocative red carpet looks to Hollywood, as it is simply not the Duchess' style.

Kate Middleton (Getty Images)Want to capture Kate's romantic evening look?
Remember these 5 important keys to the Duchess' elegant aesthetic:

1. Seek out dresses with beautiful movement. Kate always looks as lovely in motion as she does standing still because she chooses airy chiffons and light-catching silks.
2. Cinch your natural waist! Her Highness never looks dowdy or swallowed by her whimsical looks because she keeps the focal point at the smallest part of her waist.
3. Choose soft pastels and muted hues. Kate let's the fabric and cut of her gowns do the talking by opting for grays, lilacs and subtle pinks.
4. Think Grecian! One-shoulder styles, pleats, floor-sweeping skirts, rich gathers and blousy bodices are all essential elements of Kate's evening style.
5. Don't over-accessorize. You will never see the Duchess wearing over-the-top jewelry that would distract from her cleanly elegant style. Simply add touches of sparkle with a chic choker necklace, stud earrings or a shimmering box clutch.