The mum-of-four, who has been married to David for 15 years, found the bold orange mini dress while going through her wardrobe and delighted fans by posting a picture of it on Twitter.
"Look what I found!" she captioned the photo. "The dress I wore on my first date with David!! 💛💙💜💚❤️ X so cute!! X v".
Look what I found! The dress I wore on my first date with David!! 💛💙💜💚❤️ X so cute!! X vb pic.twitter.com/pXNvgwvurH— Victoria Beckham (@victoriabeckham) June 19, 2014
David and Victoria first met at a charity football match in 1997 when the Essex-born star was still in the Spice Girls and David was playing for Manchester United.
David and Victoria Beckham: The story of their love
The couple, who are parents to Brooklyn, 15, Romeo, 11, Cruz, nine, and Harper, two, dated for two years before tying the knot in Luttrellstown Castle, Ireland, in July 1999.
Now look what I found!!Stretchy pregnant dress!Brooklyn in my tummy! X👼 x vb pic.twitter.com/T8lZupyWgw— Victoria Beckham (@victoriabeckham) June 19, 2014
The 40-year-old fashion designer was enjoying her sartorial trip down memory lane, unearthing outfits she wore during her pregnancies and at numerous high-profile events.
"Now look what I found!!" She posted. "Stretchy pregnant dress! Brooklyn in my tummy! X x vb.
"Proactive day sorting archive!" concluded Victoria, alongside a flashback photo of herself with Marc Jacobs. "I ❤️ u fashion bunnies!! 🙏 amazing memories x vb".