What were life jackets made of before the invention of plastic

When was plastic invented?

KEEPING AFLOAT - a history of PFDS ~ Boating NZ

What should you know about neoprene life jackets? - Quora

Lifejacket History - Marine Warehouse Ltd

What is the difference between a baby pool float and a life jacket

Plastics History

First Lifejackets Invented in 1854 - History of the RNLI

The Age of Plastic: From Parkesine to pollution

Personal flotation device - Wikipedia

What is the best material for making life jackets? - Quora

Lifejacket History - Marine Warehouse Ltd

Bot lifejacket uses plastic waste to prevent drownings