The corduroy vest was the little sister of the denim vest in the 1970s. And the white denim vest was the little sister of the blue jean vest. Most people in the 1970s wore denim vest and jean vests and denim waistcoats colored indigo blue. Only a small part of the denim vests that were worn in the 1970s have been colored white, but they have been there and they have been worn. This white denim vest by maybe German brand TORNADO is a good example, because there is a indigo blue piece to compare.
The white one is still available on Etsy:
https://www.etsy.com/de/listing/1594164929/vintage-70er-weisse-tornado-damen
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