What is "driza-bone"

Driza-Bone, originating from the phrase "dry as a bone", is a trade name for the company making full-length waterproof riding coats and apparel. The company was established in 1898 and is currently Australian owned and manufactures its products in Australia. The trademark of Driza-Bone was first registered in 1933.

This style of coat originated in Australia as workwear for stockmen. The coats were developed to protect horse riders from the rain and feature straps that hold the coat to the rider's leg.