Long hair in a classic movie scene


A couple of months ago, I saw a message on this forum:

It was about the long hair of women in the black and white era, where women's short hair was dominant, yet some long hair was still prevalent, and the message contained a youtube clip, probably from a black and white movie featuring an actress that had her hair tied up to look short, but her lover untied her hair and it became very long, then she did love with him.

I cannot find this message with the youtube clip anymore, because there are a lot of messages on the forum, can you help me find it?