One example of a woman wearing a large, red "platter hat" is this portrait, currently at the Art Institute of Chicago. I also have plans to attempt to make a version of her chunky chain with pearls.
Sewed 2 20" circles of heavy buckram together and added millinery wire
After whip stitching millinery wire to buckram, result was too floppy. I asked for suggestions in the Facebook Landsknecht group.
Even when I added wool fabric around the brim, it was too floppy.
Based on recommendation from the Landsknecht group, I used a metal wreath ring from Michael's to achieve the desired shape.
I cut out a circle of craft paper the same size as the crown of the hat to draft the cutout pattern.
Used craft scissors to cut out the design to transfer to the crown using chalk.
I used leftover scrap of green linen as the contrasting fabric to highlight the cutouts in the crown of hat. Running stitch to sew two layers together.
I used pleats to adjust the size of the crown to the opening in the brim. After clipping in place, I used a "sailor's palm" tool to stab stitch through all the layers of fabric and buckram. Added strip of black wool to cover edges. When sewing bias tape, I also added 2 24" lucet ties to keep the hat on my head.
I used an awl to make holes through the shaft of the feathers to sew to brim. (Salior's palm again.)
I spent the whole event saying "Have you seen my new hat?!" Yes, everyone had seen it. It was hard to miss.
Materials
Red wool (Burnley and Trowbridge wool flannel)
Green linen (Fabrics Store mid-weight)
Ostrich Feathers (Lamplighter Feather 12"-16")
Sailmaker's palm