Dirty Girl Gaiters are designed to keep rocks, pebbles, dust, etc from entering shoes irregardless if one’s wearing pants or shorts. They’re not designed for leg or pant protection while bushwhacking like most gaiter’s are designed for. Since DGG started with runners in mind, yes, there’s going to be more photos of people wearing shorts. There’s not going to be a lot of photos of people wearing pants over the gaiters because, well, if you’re taking photos of the gaiters you’re not going to be able to see them if they’re covered with pants.
I wear my DDG with both pants and shorts. They work exactly as intended for. I use pants in high poison oak areas. Sure, pants offer a little added protection for the shoes as they cover the shoes somewhat, but the gaiters are still nice to have as pant bottoms don’t prevent debris from getting into the shoes.