Haven't had much luck in tracking down "Dan Briber - Greenwich, CT", presumably a mid-century menswear store. That was the label in a recently found impeccably woven and perfectly pristine wool plaid robe. Partially wool: Viyella. 55% merino/45% cotton. That was the other label: Viyella.
Wool robes are notoriously underused. The itch factor. Not the most inviting after a bath. But this one had never been used. Or maybe there is some sort of revivication quality that is woven into the threads.
Note: Father wore this shirt during the Boer War.