Druids - eschewing materials found in nature in favor of slaughtering nature and wearing the corpse since 1973.
1. Texas Chainsaw Massacre shows up in theaters in 1974.
2. Two years later, Dennis "I love the Bunnies AND the Burrows" Sustare contributes the Druid to Eldritch Wizardry.
COINCIDENCE? I THINK NOT!
Olaf, the Dim-Witted Fighter: Say, Hacky Sack Dave, that's some nice armor you have there!
Dave the Druid: Why, thank you Olaf! It's my new leather armor.
Olaf: I've always wanted to know, Dave, why is it that a hippy druid like you who won't even eat meat will slaughter animals and wear leather armor?
Dave: (taking a long puff off of his 'magic stick'): Well, Olaf, I'm glad you asked. No animals ... no friends of nature were hurt making this leather armor.
Olaf: Okay, but ... wait a second, have you seen the party's bard anywhere? I swear he was around at some point.
Dave: Mmmmm..... nope. Can't say that I have.