Yes, this is pretty similar to another outfit I've put together for a park visit, but with kids, it is a good idea to have a backup shirt. Things get mysteriously dirty all the time.
Mock Turtleneck: Lululemon (similar item linked)
Jacket: The North Face Canyonwall Fleece Jacket
Leggings: Spanx Faux Leather Leggings
Shoes: Cole Haan Tennis Grandpro Sneakers in Gunmetal
Backpack: Rebecca Minkoff