My favorite costumes are the period ones. Last year as I was 8 months plus pregnant, my choices were very limited. I whipped up a passable Regency costume and decided to make a poke bonnet from an old straw hat I had lying around the house. It was the best thing from the costume and not a bad try for my first attempt at millinery. Everything was hand-stitched and hand glued. The white ruffle insert is actually a separate mob cap I had in my costume trove that I decided to wear that night as well. (We had been out in the rain and damp watching my husband's goddaughter dance at a Halloween event. I thought it best to wear as many layers to keep warm.)
I found instructions and a video how to make the bonnet here:
I've always loved the Regency period. My love of Jane Austen, perhaps? Here's a late night related giggle for anyone out there.