Preheat oven to 375ºF.
Prepare and roll out pie crust. Line a pie pan with it and flute edges.
In a large bowl, stir together sugar, flour, cinnamon, and nutmeg.
Add sliced apples and gently toss until coated.
Transfer apple mixture to the pie crust.
Dot apples with butter. Set aside.
In the same large bowl, prepare crumb topping ingredients by stirring together 1/2 cup flour and 1/2 cup brown sugar.
Using a pastry blender, cut in 3 Tablespoons butter until mixture resembles coarse crumbs.
Sprinkle crumb topping evenly over apples in pie pan.
Cover edges of pie with foil and bake in preheated oven for 40 minutes.
Remove foil and bake 20 minutes more or until fruit is tender and filling is bubbly.
Cool on a wire rack.
Top with vanilla ice cream and caramel sauce!