Jackets Worn by the T-Birds in Grease
Puzzle 1 of Movie Props Pack
Question is: Jackets Worn by the T-Birds in Grease
and the answer is: LEATHER
Word Meaning:
LEATHER — A tough material produced from the skin of animals, by tanning or similar process, used e.g. for clothing; often denotes leather from cattle when no qualifier specifies otherwise.
Definitions from Wiktionary.