i think fashion bloggers Tom and Lorenzo described her halloween appeal better than I could:
You cannot doubt the lady’s commitment. And to her enormous credit (in our opinion), she almost always sticks to an uglifying or grotesque look. Probably because she spent a good chunk of her career modeling underwear on runways, she clearly never had an interest in dressing up in a sexy kitty or nurse costume on this night. As we noted when even her Jessica Rabbit was more nauseating than sexy, “Why would a Victoria’s Secret model want to look sexy on Halloween? That’s for the amateurs."