Bonnet found. Need Help!

Won an estate auction lot containing a lot of historical items. The matriarch was a collector, attended auctions (we've found some of her auction catalogs from 1908) and we have found items 1800's - 1960 that we can identify (so far).
This was in a sealed box packed and inventoried by a moving company. In the contents list it says "Bonnet of Ann Hathaway." I can't find any information on that individual (all I get is the current actress Anne Hathaway). We have no idea. If it has potential historical or monetary value we don't want to toss it. Any info you could provide would be so helpful as we have no point of reference on fabric collecting.