Why is that?
If you read "The Inquest" docs both the state police criminologist and the funeral home director each give a list of clothes with here body. In the case of the criminologist he states white blouse, dark pants, scandals, blue lacy bra, gold link chain for belt. (The chain belt is also described by the diver) The criminologist tested all the items for blood residue, finding trace amounts. The funeral director noted all items exactly. In neither description is any mention of underwear or undergarments.