Because of that MFA exhibit, I've been very interested in the idea of corsage ornaments, which as far as I'm concerned basically boil down to monster brooches, sometimes articulated or sometimes shaped to match the neckline of a dress. It seems to me you can call them any number of things, but they are just a category of sparkly ornament that you usually wear somewhere on your bodice. But something I've been learning (and which delights me, I must say) is that once you have a purpose-build piece of sparkle, nobody seems to care if you wear it somewhere else on your person. Got a cool necklace? Let's wear it as a tiara! Nice tiara... I'm going to drape it down the front of my dress. What a pretty brooch. I'm going to pin it to my hair. Oh yeah! Case in point, here is a picture of Olga Paley's Cartier Corsage Ornament/ Stomacher/ Massive Sparkly Brooch Thingy. And then there it is in her hat (in about 1912-1913)! Why not?