Bob Atkins , Oct 20, 2003; 07:09 p.m.
The law is pretty clear (see http://www.efc.ca/pages/law/cc/cc.163.1.html) and what you intend to shoot would not be illegal.
Of course the big...BUT... is that some people regard any depiction of nudity as pornography and if you happen to have a local DA with such views, well, you're screwed. This is the chilling effect. You're reluctant to do something that isn't illegal because you - or the parents - might get wrongly charged with something. Even if you win the case, you lose.
It is a dilemma, and only you can decide if you think the potential downside is worth risking in order to do something that is perfectly legal and fully within your rights (and the parents rights) to do.
"sheer clothing and backlight" doesn't sound like a good idea to me. A straight documentary shot seems to be what the clients want and would be less open to (mis)interpretation.
I presume living in Georgia doesn't make this decision any easier...