Prep oats: Place all ingredients in a container except chopped pecans and orange zest. Stir until well combined. Seal with a lid and place in the fridge overnight (or at least a couple hours).
Serve: Bring out of the fridge in the morning and stir. You'll notice that the oats soak up a lot of the liquid so you may want to add a little more almond milk before serving. Top oats with chopped pecans and orange zest.