If there were no articles of clothing, I would conclude that KC removed the clothes from her child's body so she could not be "identified". I also think that some form of non-human hair could have been found [though I am not certain that a ME could ascertain that just by looking at hair-particles] on the remains or duct-tape. If KC was in that house with the body of her child, whether the child died in that house or not, it is possible that the Anthony dogs had come in contact with Caylee's body.