Panty lines are almost always unsightly bulges created from elastic that is too tight. Most people don't even know they get them, but most of those people actually ger them across their ass cheeks and think people won't be able to tell because of the decorative seams on their jean pockets. This is overwhelmingly a ladies' thing, given how high ladies' underwear is often cut. My solution for underwear lines? Don't wear underwear! I often don't, and I don't really get the big deal with going commando, either.
Also, I thought it was just one of those things about modeling, where you didn't wear underwear under the things you modeled, kind of like ballet with leotards and tights, but maybe that is just me (and my friend who is a small-time model, whom I asked).
Cheshire Cat: I usually notice them more on the ass, too! But hers cut into her hip so much that it is way noticeable.
Incidentally, I love both of those dresses, but the second one caught my eye first. I had to consider the ruffles on the first one and decide whether or not the dress would be the same without them (it wouldn't).
Edit: Oops, missed a page there.
