Princess Lilibet, the five-year-old daughter of Prince Harry and Meghan Markle, has caused a children's fashion sensation. According to reports, items she has worn in recent public appearances—including a £320 Cult Gaia dress, a £39 Janie and Jack nightgown, and a £38 Hope & Henry tartan dress—have sold out within hours of being identified by royal fashion watchers. This pattern, dubbed the 'Lilibet effect,' echoes the decades-long 'Markle sparkle' that has driven consumer demand for Meghan's wardrobe choices.

The £320 Cult Gaia Dress That Vanished Within Hours

For Lilibet's fifth birthday on June 4, Meghan shared two photographs on Instagram, calling her 'our dream girl.' The images showed Lilibet wearing a Kids Lola Dress from Cult Gaia—a beige linen-blend sundress with a smocked bodice, delicate straps, and intricate laser-cut detailing at the hem. The dress originally launched as part of Cult Gaia's inaugural children's collection in October 2025, and remained available until Lilibet's appearance sparked a massive surge in demand. As the source notes, within hours of royal fashion accounts identifying the garment, it sold out across the brand's website.

From Janie and Jack's £39 Nightgown to Hope & Henry's £38 Party Dress

This phenomenon is not isolated to a single occasion. Earlier in the year, Meghan posted photographs of Lilibet and her brother Prince Archie during an Easter egg hunt. Fans identified Lilibet's nightgown, the 'Lili's Good Night' design from American children's brand Janie and Jack. The £39 nightgown, adorned with a pink ditsy floral print and deliate ruffle detailing, quickly sold out after the pictures were published, according to the same report. Similarly, last November, when Lilibet accompanied her family on a Thanksgiving charity visit in Los Angeles , she wore a festive red tartan dress from sustainable children's label Hope & Henry. The Taffeta Party Dress, featuring a black bow and ruffled sleeves, captured immediate attention. Demand surged following the publication of the photographs, and the £38 style soon sold out across major retail channels.

A Pattern Echoing Meghan Markle's 'Markle Sparkle'

The 'Lilibet effect' mirrors a broader trend established by her mother. Meghan Markle has long been recognized for driving consumer demand, frequently causing items she wears to sell out within hours of public appearances. While Princess Lilibet's sightings are relatively rare, each new photograph generates enormous interest, and the clothes she wears are increasingly becoming must-have items for royal fans. This pattern raises questions about whether the influence is organic or amplified by strategic brand placements—Meghan herself has worn Cult Gaia in the past, creating a link between mother's and daughter's fashion.

What We Still Don't Know: The Numbers Behind the Hype

The source provides anecdotal evidence of sell-outs but does not disclose exact sales figures, inventory levels, or whether brands issued official statements about the surge. It is unclear if the 'Lilibet effect' translates to sustained revenue growth for the featured brands or if it is a short-lived spike confined to a single size run.. Additionally, the report does not include any response from Cult Gaia, Janie and Jack, or Hope & Henry, leaving open the question of whether the companies actively coordinate with the Sussex family or merely benefit from serendipiitous exposure. Without independent sales data, the true magnitude of the impact remains speculative.