I'm a size 4 and order this belt in small.
Bought it in stone color for hiking because my cargo pants and shorts sit bellow the waist and need to be held in place.
Unlike the ones in military style, this belt won't slide out, the buckle keeps it tight.
Love that the buckle isn't shiny and that's got some style to it. The stone color is very neutral and classic. The fact that the belt is flat is also a plus (unlike the braided ones) because it slims down your waist or hips, instead of making them look thicker than they are.
I like it so much that I wear it with jeans as well. High waist jeans for ridding, low waist... doesn't matter, it fits.