When it comes to the royals and fashion, it's survival of the chicest, and as Meghan Markle and Prince Harry took in a gala performance about Charles Darwin at the Natural History Museum in London, the Duchess was every inch the elegant royal. 

Markle, 37, who is expecting her first child in April, pulled off another monochrome ensemble masterfully, proving the eternal secret to winter white ... is to not always pluck for white. 

The Duchess gave a masterclass in monochromatic dressing. Photo: Getty

Pairing a custom pale cream roll-neck dress by Calvin Klein and a coordinating €1,020 coat by royal favourite Amanda Wakeley, the Duchess was positively glowing even in the dim evening, as she took in a performance of The Wider Earth, a play about Darwin's expedition on HMS Beagle, with husband Prince Harry. 

The outfit was perfectly matched, right down to Meghan's nail polish. Photo: Getty

She accessorised her outfit with her much-loved olive suede Ralph Lauren pumps and a matching clutch. Her hair was pulled into an elegant and sleek bun, while her makeup showcased her naturally radiant skin, accented with blush and bronzer. 

A touch of blush and bronzer kept the look fresh. Photo: Getty

The performance was held in support of the Queen's Commonwealth Trust (QCT) and the production's official charitable partner, The Queen's Commonwealth Canopy (QCC). 

The former actress consistently shatters the norms for maternity dressing, which typically advises that woman downsize their bumps by wearing muted colours. Choosing an all-cream look highlighted her glowing skin and sparkling dark eyes, while bringing a touch of early Spring to the evening. 

Paired with her favourite olive Ralph Lauren heels and clutch, Meghan was as stylish as ever. Photo: Getty