I suppose so, but I'd like to think that whoever is doing it would at least attempt to show something (for lack of better words) patriotically symbolic to the applicable state. For example, I don't think it'd be an accurate portrayal of Washington if someone were wearing sunglasses, a straw hat, swimming trunks, and carrying a surf board. If it's just basic clothing, that's kind of a cop-out. For either Oregon or Washington, I could see them being something along the lines of a hiker or a hunter, some sort of outdoorsy character.
Good point; it is a con panel, anyways, no need to be that picky, right?