Ruths Creations - good question. I think that the general labelling requirements held for clothing will apply to this as well. So a sewn in label would be considered a "permanent label". Just my opinion. I agree with your assessment that a "hang tag" is a paper label attached to items with a plastic barb.
Of course, I haven't seen a definition on the CPSC website, so I'm not 100% sure.
3Hands2Hold - I'm sorry, I just have to say it. PLEASE stop spamming every thread. I *know* you want to help but once or twice is enough!