One of the many fascinating items found on the Mary Rose, the sunken fastship of King Henry VIII, is a knit hat. A recent photo from the Mary Rose's Facebook page (public) shows a conservator working on preservation of a hat. (photo)
From the website:
Three near-complete examples of these hats were found, all possessing the double brim that appears in illustrations of life in the 16th century, two of which contained a square silk lining and had a silk band between the brims.