Mum is the one on the far right. I'm pretty sure that she made this dress, because I know she made the matching purse on her arm. Mum and Nanna used to do a lot of sewing. I don't know how they did it. I always found sewing to be too difficult for me. I guess I don't have the patience.
This photo says it was developed in June of 1970.
Great gams, eh?