Interesting Isus. I suppose that from now on the topic on the forum would be...What is your favorite skin?" What skin is next in for you?" Come and check my new skin"
The last time I was in New York, my SA said "Where's the leather book?" She didn't say "Where's the skin book?" If she did, I would have thought she was distracted and looking for porn!
i think it's rude to correct a customer who uses a different word that is still utterly appropriate. according to wordnet.princeton.edu:
leather - an animal skin made smooth and flexible by removing the hair and then tanning.