I have a couple brooches and I use then on the back of some of my jersey razorback or crisscross dresses.
a girl i used to work with them used to pin a thin ribbon around her waist with a CC to make a belt as well as sometimes use it to alter the shape of a sweater (i.e make it look like a wrap around). She always looked fantastic when she did it and it gave function as well as form to her broach.
Its a beautiful broach - you are so lucky!!
if you wear pearl necklaces, you can put your brooch on 2 or more strands of pearl necklaces and make the look more glamorous and polished