Watching a few episodes of the Jeeves and Wooster TV series, I noticed Bertie Wooster often has some kind of leather strap or brown ribbon running from the label buttonhole of his sports coat, into the breast pocket.
What is it? A watch strap or something like that? My google-fu fails.
It’s set in the 1930’s, and presumably has authentic period clothing. If my description makes no sense I’ll try to grab a screen shot.