I have a long scar from my tummy tuck - it goes from behind one hip, across the front, to behind the other hip. I just less than 4 months out and it does not bother me at all and my underwear and jeans rub on it all day.
If your surgeon is good - make sure you consult with a few - I wouldn't worry about scar irritation in the long term.
For the first 6 weeks it was covered with gauze & padding so while it was still in the scab phase it didn't bother me much either.
Started - 12/25/11 at 265 lbs.
ONEderland - 2/16/13 at 199 lbs.
Goal - Normal BMI! - 7/17/13 at 155 lbs.
Restart - 1/29/15 - 185 lbs.