Hello, that's an interesting question. The tummy tuck technic has been in development for over 100 years. Originally, the first problem with the technic was what to do with the belly button, but as the procedure was perfected, and bathing suits became smaller, and in different shapes, the tummy tuck surgery had to undergo some changes. During the 80's for example, tummy tucks were made with a deep V, because of the high riding bathing suit in fashion at the moment. Since fashion nowadays is actually very personal, some people like to use low riding garments, others a little higher, etc; what I like to do is tell the patient to bring a bathing suit and underwear that they would normally like to wear, on the day of the surgery, that way, when I make my markings, the scar will remain hidden inside the clothes. I don't like a straight line, as you stated prefer, because the outer portion of the scar will hang outside every piece of bathing suit you might wear. The zig zag is not normal, either that patient had a mishap during the post operative period or the scar was not adequately done. So you see, different shapes, just mean different fashions, A good surgeon will always make a scar suited to your needs, and that will be easily concealable. Hope to have been of some help.