As I mentioned early Michael O’Connor decided to use extant pieces which is why so many people fell in love with this bonnet.
Why re-create when you can just use the extant piece?
"… Fortunately for O’Connor, there was no shortage of reference materials. He researched all the children’s clothing at a children’s museum in London, and he even found an American Web site that had block prints of original 19th-century patterns, which he ended up using to make Jane Eyre’s final dress—topping it with a shawl original to the time and a bonnet made of straw from the period. “The lining, the buttons, the stitching, everything was totally researched. I always say, ‘Is there a reference for that, is that something they did?’ And if people say [they] don’t know, then I say we can’t do it—there’s so much information from that time that there’s no excuse not to have it.””
”Mia Wasikowska’s Jane Eyre (arriving at Rochester’s estate, Thornfield) wears a dress “made from an imported, printed textile from the U.S.,” and a bonnet “made from beautiful, vintage hat straw [which] we were gifted,” says the Oscar-winning designer.”