According to The Sun, royal etiquette expert and The Beaumont Etiquette founder, Myka Meier, says the secret to hiding lines is special underwear.
She shared a tip on Instagram which she claims Kate uses–investing in a seamless body suit.
Posting a photo of the royal at Ascot in 2019 wearing a blue Elie Saab dress, she wrote: "Royal Style Hack Alert! Ever wonder why you never see bra straps?! Swipe to see a secret trick which is a must-have royal wardrobe piece!” before sharing an image of a neutral body suit.
Meier told the publication: "Underwear and bras are considered private intimate wear, and for royals to put intimate apparel on display would simply not be done."
She continued: "One option being a bra that is actually sewn into the piece. A second option is strapless shape wear, which is a one piece that either snaps at the bottom or has legs attached."
So if you want to keep your undies under, you could try this.
Otherwise, as you were.
This article originally appeared on Marie Claire U.K.