Well, I have had a c-section and two VBACs. Yes, it affects the appearance of my lower stomach, as the muscles were sliced through for the surgery, but honestly it isn't much different (visually) than what most moms end up with due to carrying full term pregnancies. Diastasis (however minor) of the abdominal muscles, stretching of ligaments and skin, spreading of hips, etc etc, all contribute to a pouchy mummy tummy.
Losing weight helps, it deflates the area quite a bit (especially when you get to lower body fat percentages) and generally just leaves a little loose skin, but even with strength the underlying muscle issues creating the abdominal bulging often remain. That is dictated more by genetics than type of delivery, just like stretch marks.
All I can say, is that clothes hide it well and shape wear is my friend. I've had three children, all overdue and big, healthy babies... My body is going to tell that tale and I'm not ashamed of it! I don't look like the woman I was before children, because I'm not! It is a huge physiological event and it has left marks on my body as much as my heart