In all, nine designers made it through to the final. They all had to show the judging panel their latest line and discuss their plans for the future.
Among those who decided the winner were British Vogue editor Alexandra Schulman, UK Prime Minister's wife Samantha Cameron, Marigay McKee, Joan Burstein and Caroline Rush.
"I am delighted that Jonathan has won this year's award," Alexandra said.
"His recent collections have shown that he is a designer who can provide beautiful clothes that women enjoy wearing and he is in a great position to build on his current success."
Check out a clip of Jonathan Saunders talking about the fashion industry:
- AAP