
The Duchess of Cambridge (Kae Middleton) wore the Hobbs London Dalmatian Mac during two of her pregnancies.

First, in June 2013 when expecting Prince George. She wore the coat to christen the Royal Princess ship:

Kate wore the coat for a second time during a visit to Margate in March 2015. She was around 8-months pregnant at the time with Princess Charlotte.

About the Hobbs Dalmatian Mac:
Hobbs crafted the collarless knee-length coat from Dalmatian-print fabric. Black spots sit upon an ivory background. It features long sleeves.

From the Hobbs website (back in 2013):
Dalmatian is the print of the season. Be stylish and animal friendly with the Hobbs Dalmatian mac – a minimalist design that lets the print make the statement. Hanging to the knee, the collarless coat has a zip fastening and two front pockets. Wear it with a simple outfit to give the mac its full effect.
Here’s a closer look at the fabric and the Dalmatian spot print:

Sadly, as you’d expect, the coat is no longer stocked by Hobbs London. It originally retailed for £169.
About Hobbs London:
Hobbs London appears to be one of Kate’s go-to brands for public engagements. The Duchess has worn a number of pieces from the high-street shop over the years.
She wore this spotty sheer “Emilia” top back in November 2014, during a visit to Place2Be.

She also owns a couple of coats by the brand, including the green “Persephone” trench, which she wore while watching the St. Patrick’s Day Parade at Mons Barracks back in March 2014:
