Perfume is signed by forming the ASL letter A sign with your dominant hand, and sticking the thumb out as it touches one side of the base of your neck, where it joins your collar bone. Then lift it and repeat the action of touching your thumb to the other side of your neck.
It is like the thumb is the bottle spout or spray nozzle, and your 'A' hand is the rest of the perfume bottle. You are mimicking the application of actual perfume.
Teach your toddler the perfume sign when they start showing interest in the fragrances they see you or your spouse applying before heading out to the office or when you are all decked out for a special occasion.
This is a useful flash card taught best in conjunction with other objects, flowers, and food that emit pleasant smells or fragrances. As our toddlers grow, we want to help them develop all their senses while learning at the same time.