Phyllis, not knowing exactly how your hair is thinning - ususally shorter hair makes hair look fuller and thicker. Something with layers that are about 4 to 5 inches long. Is your hair straight or do you have any wave? Currly and fluffy is better to conceal thinning hair. A bob that is all one length will probably do nothing to help conceal thinning in the crown so would not be th bess choice.