The royal uses a life hack so that no bra straps or seams from other undergarments are visible under her dresses.

According to a royal etiquette expert, the princess follows a few simple style rules to keep her looks flawless.

Kate wears seamless, strapless underwear under her outfits, or mostly flesh-colored shapewear that isn't visible under other clothing.

Princess of Wales / Photo: Associated Press

Princess of Wales / Photo: Getty Images

Underwear and bras are also considered personal intimate clothing, and royalty simply cannot flaunt intimate clothing.

All things considered, there are several options when it comes to concealing bra straps and cup shape, one is having the bra sewn into the garment, and the other is choosing strapless, shapewear," say style experts, writes express .co.uk.

Princess of Wales / Photo: Associated Press

Kate and William / Photo: Getty Images

Princess of Wales / Photo: Associated Press

Royal persons also often wear bodysuits as underwear.

For example, Meghan, Duchess of Sussex wore bodysuits that matched her pants perfectly.

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