Charlene Tilton

 

Charlene Tilton, better known from tv-series DALLAS, appeared in the 1979 tv-movie "Diary of a Teenage Hitchhiker", wearing a dark blue denim vest in the scene, were she's threatened by a bad car driver.

Source was only the videotaped tv-movie, not the DVD, so the picture quality isn't hq. 

There are more pictures of Charlene wearing sleeveless denim from the DALLAS times...

... this piece is a red neckholder vest, but it looks like being denim.