The Duchess disclosed that the disagreement had stemmed from flower girls’ dresses—a matter detailed further by Harry in his memoir, Spare, published in 2020.

According to Harry, Kate insisted that the “French couture” dresses needed to be remade. Meghan, inundated with wedding preparations and dealing with the chaos surrounding her father, had suggested the dresses be altered by the on-hand tailor.
Harry recounted a text exchange between Meghan and Kate. Kate reportedly texted: “Charlotte’s dress is too big, too long, too baggy. She cried when she tried it on at home.”
Meghan responded: “Right, and I told you the tailor has been standing by since 8am. Here. At KP. Can you take Charlotte to have it altered, as the other mums are doing?”
Kate replied: “No, all the dresses need to be remade.”

Harry added that Meghan reminded Kate of the turmoil she was facing with her father at the time, but Kate remained focused on the dresses, saying: “I’m well aware, but the dresses. And the wedding is in four days!”
Meghan’s final response was reportedly: “I’m not sure what else to say. If the dress doesn’t fit, then please take Charlotte to see Ajay. He’s been waiting all day.” Kate ended the exchange with a brief: “Fine.”
This exchange, as revealed in Spare, shed light on the tensions leading up to the wedding, offering additional context to Meghan’s comments during her Oprah interview.