"Regarding weigh-ins, previously both male and female contestants had to weigh in wearing ?no more than a suitable undergarment.? Beginning next year, specific language has been added regarding what constitutes a ?suitable undergarment.? Male and female contestants will be required to wear a suitable undergarment that completely covers the buttocks and the groin area. In addition, for female contestants the suitable undergarment must also cover the breasts.
Bob Colgate, assistant director of the NFHS and committee liaison, said the change was made to consider privacy issues for all individuals involved with weigh-ins."
The way I read it you can still weigh in naked, but if you choose to wear anything, it must follow the guidelines listed above.