What is the problem with these pants? I will tell you...
The waist is about an inch too large, creating a "bunched up" effect when a belt is worn. As you can see, the normal waist of the pants droops below the belt because there is simply too much material.
This is a common issue, and not as easy to avoid as you may think. For instance, in the case of these pants, the rest of the pant fits well. When I tried on the next smalest size, the waist fit better but the cut was much tighter on my legs.
What is the solution to this problem? Eat many more Trader Joe's Dunkers so that your waist expands.