Mysterious New England Flannel

Exquisitely made heavyweight flannel. Tailored fit. No tags, but for the one that says Made in New England. What size is it? Who made it? Where did it come from? What’s it made of? Can it be tumbled dry??? I rarely wear this, but when I do, the old men down at the docks lower their eyes when I walk by. And one time, I saw a spooky apparition like a rotting, drowned Gloucesterman in the mirror behind me - but when I spun around, he was gone, so like no worries