Possible Clues:

• Cobbler's materials
• A shelter compromised by Hell's Angels outfit?
• Biker's protective wear
• A shelter compromised by Hells Angels outfit?
• Biker's gear abandoned in a shelter
• Suedes and other skins
• Calf, Moroccan or chamois, say
• Belts that are worn by Hell's Angels
• Tanned skins
• Saddler's materials