I was watching Secretary which had Lesley Ann Warren in it and that started me thinking about her starring in Cinderella. I googled a bit of it (YouTube) and it was in color! Was it colorized, I could have sworn it was in black and white.
Also, my wife couldn’t remember it. Didn’t it come on once a year like The Wizard of Oz?
God I had a crush on her when I was a kid.
I still remember the woman at 1:38 in “The Prince is Giving a Ball” and thinking “wait - what’s wrong with her? That’s what grown up women are like.”
It premiered in 1965, so it very well could have been orginally in color, as many (most?) network TV programs were broadcast in color by then, though a lot of families still only had black-and-white TVs – sales of color TVs didn’t surpass sales of B&W until the early '70s.
Wikipedia says that it was rebroadcast eight additional times through 1974, so that does indicate that CBS aired it annually.
The Lesley Ann Warren version was actually a remake. The original version starred Julie Andrews, and was made in 1957. The Julie Andrews version was broadcast live, in color. The only surviving record of that broadcast is a black-and-white kinescope of the broadcast. It wasn’t shown very often, but is it possible that you might have seen that kinescope? Lesley Ann Warren’s version was always in color, as far as I know.
BTW, a couple of years ago I appeared in the stage version of this show in community theater, which has the same songs but a new book by Douglas Carter Beane, in which I got to sing “The Prince is Giving a Ball.” It’s a fun song.
It was a yearly event, like The Wizard of Oz. I remember watching it every year. I watched it in B&W for the first few years. We had a B&W TV until the very late 60s.
I was too young for the Julie Andrews version. My first exposure to any film of Cinderella was the LAW version. It was in B&W for me, because we didn’t get color until 1980.
LAW was my first celebrity crush, I was 5. But, alas, she was too old for me. 
D’oh! That had to be it. Thanks for pointing that out.
I was 10, so I considered myself in the running. 
Some great songs in that. I also liked the Prince being sort of snide and snarky.
I always loved the Lesley Ann Warren version. In fact, just a few weeks ago, I mentioned to my daughter that I want to watch it again.
Also, it has one of my obscure movie quotes that no one catches. After I had shoulder surgery, my shoulder would squeak from time to time, loud enough for other people to hear. No one ever caught the reference when I mentioned rubbing unicorn oil into it.
The Stepsisters Song is a particular treasure.