That picture is actually from a German family TV game show. Google "wuensch dir was bluse" for the youtube clip. You will also read why I suggest you search.
The darkhaired is the mother who has to guess which outfit her daughter will wear. The daughter then wears it, and mom is happy :) On prime/family time state TV.
Those were the days, my friend, ...

World's Fair, 1964. One of the national pavilions (German, maybe). The shop girl was wearing a thin nearly transparent black top, braless. Unfortunately, the top had pockets over her small breasts, so I could not see her nipples. Very memorable for a teenager...

DR

Sheer
 

Back in the 70's ,I was 15 and was at my seat at a local Modified race track,this lady sitting about 3 seats from me stood up and looking at her with the sun behind her you could see clean through her shirt and no bra,I'll never forget.

We are obviously the same age range and similar memories. I had a hot blonde divorcée in the neighbourhood (I believe mentioned in other strings here) and she would wear these beloved sheer tops all the time.

With a line up of us teenage males waiting to give here a hand with anything she needed done.

Next to the discovery of the local nude beach, her divorce was up there on the scale of great evolutions in life. My girlfriend was her babysitter so I had a bit of an in and watched her get dressed for her dates. Her with the frequent nipple slips and me with a tent in my pants. Good times all round.

Believe it or not, the first transparent sheer shirt I ever remember wasn't until a recent job in my 30s! It was our HR lady...she had a sheer white blouse on with a sheer white bra under it. I remember she was on the phone during her lunch yelling at some handyman while pacing back and forth in the breakroom, with her very saggy small breasts swinging around despite having a bra on, dark nipples pointing to the ground.

She was a horrible, mean person, but I loved seeing her outfits most days!

The one good sheer story I have is my wife and I at Fenway Park in 2005 or 2006. Wife was wearing a white cotton top, no bra. She has great tits. Well we're in the bleachers and it started to POUR! and when I say pour I do mean pour. Like everyone else we scrambled to the lower level to take shelter. It was about that time she looked down and her cotton shirt was basically transparent. She covered up and went to a concession stand to buy a sweatshirt. All the men were disappointed lol.

sheer
 

Best one I remember,it was a hot summer day and we stopped at a local bar,a friend of our Annie stopped also,she was a very was a down tipretty busty blonde,when she ran in it was a downpour and she had on a very sheer white blouse,it was like nothing at all she was wearing,when she came in she said look I;m transparent,and she was.
I don't have any pics of my wife in a sheer shirt but I do have some wide open cleavage shirts.

Must have been on TV. Except for Belgian tv, which was kinda prude, we loved watching shows on Dutch, German, French or Italian channels which showed a lot more nudity, even in prime time. And to imagine most if not all channels were public channels back then.

In real life, nothing in particular comes to mind, but being born in the late 70-ties, thus growing up in the 80-ties and 90-ties, there was plenty to be seen. Toplessness on beach and at friends, sometimes even nude. I can only say that the world has come less relax / more prude about social/public nudity.

Very likely due the camera everyone now carry’s in their pocket and then posts to anti-social media. It’s a shame

I had one just today.
 

Dropped into my (soon to be ex) mother in laws house to help with a job. She was wearing a super thin t-shirt without anything underneath.

She would be a b-cup, and although a bit smaller than her daughter, the shape and colour was remarkably similar. Her nipples were poking out as she jiggled around and I could clearly see the pink nubs and dark areola. Very perky for a woman her age