Meghan Markle and Kate Middleton are fashion icons whose clothes sell out almost immediately - here are 13 of their favorite brands

Chris Jackson/Getty Images

• Kate Middleton and Meghan Markle are both fashion icons, and almost everything they wear immediately sells out online.
• Middleton tends to have a more traditional sense of style, while Markle's clothes are more trendy.
• Some of their favorite brands include Line The Label, Stella McCartney, and Jenny Packham.

When Kate Middleton or Meghan Markle wear something, it sells out almost immediately.

The so-called "Kate Effect" and "Meghan Effect" have had drastic effects on the brands they wear, launching them into popularity and immediately selling out styles online. Their popularity also contributes significantly to the British economy, with Brand Finance estimating that Markle's joining the royal family this year could bring an $677 million (£500 million) boost in the form of tourism, parties, and memorabilia sales, Forbes reported. Middleton's fashion-icon status contributed an estimated $205 million to the economy in 2015.

While Middleton opts for a more traditional wardrobe, Markle tends to be more trendy in her choices, though they both wear a mix of over-the-top expensive and surprisingly affordable clothes.

Keep scrolling to see some of the brands that Middleton and Markle love:

EXCLUSIVE FREE SLIDE DECK:
The Future of Retail 2018 by the BI Intelligence Research Team.
Get the Slide Deck Now »