Here are the beginnings of my ribbon leaves for the 1930 Leaf Evening Gown. I am creating the leaves from two different widths of ribbon. That of a 2" width for the shoulder strap leaves and 3" width for the back train.
I followed instructions for vintage boat leaves provided by Carole Sidlow at RibbonStore.com (which are also included with the pattern):
Link to ribbon leaf instruction
Larger leaf (for the train):
Smaller leaf (for the shoulder straps):
A pair of leaves for the shoulder strap: