Terri Williams, Sharnee Zoll-Norman, and Maggie Lucas are joining Carolyn Kieger's coaching staff.
The uniforms will be revealed sometime before next season.
Penn State completed a series sweep of Michigan State, putting the Nittany Lions in good position to return to the Big Ten Tournament.
A combined score of 25-7 propelled the Nittany Lions to victory.
The Nittany Lions took sole possession of seventh place in the Big Ten standings with their series victory over Illinois.
Harrar, who was once committed to Army to play tight end, will reportedly lace up the cleats once again on the gridiron.