Pretties were Lunetta Brogan's name for her special dress made out of colored patches of various cloths. It was given to her by her mother, and worn by her as long as Tobias Brogan could remember. While it made Lunetta look ridiculous, Tobias didn't object, believing it appropriate for a servant of evil. In fact, he tended to give his sister scraps of colored fabric to add to the dress, to Lunetta's apparent delight.
In reality, however, the pretties' appearance hid a purpose far from ridiculous. It was a powerful magical talisman of unknown origin. Lunetta's mother taught her how to use it to touch her Han all the time, enabling her to constantly hide her true, attractive appearance in favor of a more homely one, as well as block Tobias' awareness and use of his own gift.
During her and Kahlan's captivity by Brogan, Adie realized that a magical talisman must be responsible for Lunetta constantly touching her power, and that the pretties must be that talisman. Ambushing the sorceress as she entered their room, they tore off her dress and threw it in the hearth, destroying the artifact.