I have been a nurse for nearly ten years and have never heard of such a thing! My suggestion would be to write a letter to the director of the facility and state the concerns that you have, why you have them, and suggest an appropriate resolution such as "I feel it would be appropriate to provide my grandmother with "x" size because the larger size does not provide adequate protection from wetness and that it places your grandmother at increased risk for skin breakdown. Additionally, tell them straight out that if reasonable measures are not taken within a specified number of days that you will report this to the Department of Health and Human Services and to the Joint Commission for Accreditation of Health Care Organizations (JCAHO). I assure you that this will get there attention.