Do you know of any... headwear?

After writing my PhD thesis (which will come out one day in English, I have not forgotten you - I am doing things towards it) I was quite happy to get going on some other writing/research topic. Unfortunately, though, that project fizzled out very soon in its career.

Then all those other things that will assault a freelancer and beg for time took over. Organising or re-organising things, getting smart about how to do invoices, keeping track of finances, sourcing goods that I could sell on markets, preparing workshops, flyers, business cards and so on. The decision to do a blog, and the time that went into it. Projects usually came (and still come) in clumps as well, tearing huge rifts into plans and schedules. And Textile Forum came into my life and took over for a few weeks each year (and will do so next year). In short, I did not get around to do much writing and research for the other book project that was still in my figurative desk drawer. And I sort of fell into a research hole.

Then came the opportunity to work again on that project. Let's call it... Dusty Old Bookproject, or DOB for short. I started, did some stuff, and ran against a wall because what I had thought would be a slight restructure and extension... was not. It needed a full re-thinking, re-working and re-structuring, and I could not see that yet. So I did some things on and off, but it really didn't come along very well. And there was still all the other freelancing stuff to be taken care of, which takes a huge chunk of time, continuously.

Then along came Exciting New (to me) Bookproject, and I suddenly rediscovered that research is such a huge heap of fun. Pure unadulterated fun in sitting in the library, going through books, taking up snippets of information and learning new things, new angles, new concepts. So now I am working on both of them, DOB and ENB, and instead of having a bad conscience... I feel good, because I am actually doing more work on DOB now than I did before ENB came along.

And I'm at a stage for DOB where I am looking for more material. More specifically, I am searching for links or books or hints on where some more extant headwear might be found. Date range is from about 500 to 1500, though I might narrow that down for the final book. Geographic range is Europe. And I'd be delighted if you could tell me of some, because just like the proverb says: Four (hundred) eyes see (much) better than two.