Make It a Double

That second smaller pocket, just above the right pocket on a jacket is referred to as a ticket pocket. And you're right, it's nothing new. Historically, it was a feature only found on "country suits," as its sole purpose was to conveniently store a train ticket. But once gents realized they could slip all sorts of handy things in there (from loose change to their cigars and a book of matches), that tiny pocket started being requested by bespoke clients for their darker, city suits as well. Today, they've become something of a mark of craftsmanship and style, akin to working buttons on your jacket's cuffs—not necessary, but sort of nice to have. Especially if you need a slim place to stash something.