Wear your garter on your left leg but don't wear it too low on your thigh. You don't want it slipping down during the ceremony and it will give you a real boost when all the men stare at you flashing your stockings top when the time comes to reveal your garter to the photographer. Have a great day, it is one of the best of your whole life
I dont think it matters wear it were you want but as Phil said dont wear so low it falls down and he it right its the best day of your life next to giving birth. Have a great day