OK, here it is. The Slipper and The Rose. British film from 1976. Not a patch on the lovely version
@hope shared with us but it's decent and the fairy godmother is awesome, imo. I disagree with her about sparkly godmothers but, apart from that, I adore her. wend, I think you'll especially appreciate her style. And I don't mean clothes, lol.
Time stamps for Annette Crosbie as awesome fairy godmother:
1) 41m - 44m - first meeting
2) 55m - 1hr 2m - she makes the clothes for the stepmother / stepsisters
3) 1hr 4m 30s - 1hr 7m - she makes Cinderella's ballgown
There is another scene with her, towards the end, but I'm all time-stamped out so this'll have to do, lol.