There is a great deal in Lolita fashion that one can wear atop their head and each frilly has an item they are quite partial to. I, too, have one and if you read my blog you know what it is without a doubt.
Short and simple answer, I love bonnets of many varieties and styles, I just can't get enough of them, with about 6 or 7 in my possession at the moment. I plan for more! I am currently making another Witch's Bonnet for my Black Cat jsk but I'm planning on making more for future cords and as for purchasing I am on the hunt for another 3F bonnet.
The one item I love putting on my head is definitely my 3F bonnet and I have plans for more!