Here an example from my skin pack:
{"pilot_F18C_body", 0, "F18C_SwissDW_Pilot_FlSt11", true},
{"pilot_F18C_helmet", 0, "pilot_f15_helmet", true},
{"F18C_Helmet_Glass", 0, "pilot_f15_helmet", true},
You'll find the template here:
http://forums.eagle.ru/showthread.php?t=133127