My mom already has a day cap that she wears under her bonnet, but it's gathered to an elastic band that tends to slide around and fall off. This one has no elastic and sits a little better on her head.
I snapped this pattern up a few years ago and have been itching to use it ever since.
I had a few big pieces of striped silk and cotton voile left over from a previous project and some ivory picot ribbon that was originally going to be a sash.