"c. late 1700's, 18th Century Calash Bonnet of Green Silk! I've read that most calash bonnets were formed of green silk, though I can't tell you why! I have seen black, blue and tan, but green seems to be the norm. They are rare to find outside of museums, but you can find them now and then... but RARELY if EVER do you find them in this amazing condition! It's almost like new!! I can't find anything to mention other than two tiny tears in the ivory lining."