Dave, you don't know bunnet? How long have you been in Scotland, then? Yes, read bonnet. On the other hand, maybe it's only heard in Glasgow or Paisley...
Bandanas. They are really useful items. In summer they absorb the sweat off the head and in winter they keep it slighty warm. Best of all, unlike a hat of any description, you're not expected to remove a bandana when you venture into a bar for a bite to eat, which means less stuff to forget when you leave. Baseball caps, the alternative for all seasons, offers more protection for the nose in high summer - dangerous stuff, sunlight - but live at high risk in the wind, where they can fly into the sea and be lost forever. I once had a straw hat do that, but I managed to hang over the wharf in time to catch it before it drifted away. That was then; such acrobatics are well out of contention today. But bandanas too have a critical size: too small and they don't tie properly; too large and they look like a woman's item. The single type I detest is the fake version with little tape ties.
P.S. Not tied in a bow, Dave, tied in a reef knot. As you suggested, must not lose the piratical context.
P.P.S. That's a rather rude set of rollers that lady's wearing.