I found some South Korea Vinyl Album covers from the 1970s showing women with denim vests. Found in the WWW.
The woman above in red and blue is Kim In Soon / 김인순 and the album from 1979 is named 새노래 히트송모음.
Next lady on the ground is Na Hee-myeong / 나희명 and the album from 1975 is named 사랑은 이런건가봐 그리운 연인들.
I'm not sure, if the one with the cap is a lady too, but here we are: Lee Jung-Eun / 이정은 and the album from 1980 is named 멋장이 꿈을 먹는 아이
Last one is Ji-Young Moon / 문지영 and the name of the 1979 album is 문지영 새노래집 연애작전