George and Charlotte at the Houghton International Horse Trials

What George wore:

Jacket: Joules Baby Mildford (could be)

Sweater: Next Navy Stripe Crew Neck (13 pounds)

Shirt: Trotters Harry polo shirt (20 pounds)

Trousers: Amaia Kids Carefree Shorts (40 pounds)

Shoes: Chuck Taylor 2V All-Stars (30 pounds)

Socks: Trotters ankle socks (3.99 pounds)

What Charlotte wore:

It's unclear because we don't get a full image of her, but I think the sweater is this one:

Sweater: M&H Blue sweater (20 euros)

Bow: Amaia Kids (2.5 pounds)

Others:

Stroller: Out N About Nipper 360 single V4 (400 euros)

All the photos: