1970s Guide or Guide leader uniform (Malvern Link WR14)

I am organising a fundraising event, for 7th Malvern Brownies and 5th Malvern Guides. The event has a Seventies' theme. I only have a couple of uniforms for the Brownies and Guides to wear and I would like more of them to be able to dress up. Any help would be much appreciated.