Vintage off-road clothing for me was jeans and my Army fatigue shirt, with Army boots.
Helmet? Never heard of one until about 1985.
Around 1981 a Japanese magazine did a story on the new bikes coming out of California. For their example of "typical" clothing, they used a barely disguised drawing (from a photo) of Gary Fisher in jeans and plaid flannel shirt, with his customary knit cap.
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