As you zoom in to see the stripes of this gentleman's work jacket, you'll notice that the dots are actually stars. Fabric such as this, with stars in its pattern, is typically associated with the centennial of the United States in 1876. To my knowledge, this particular stripe was referred to as "Centennial Stripe", but that may have been one manufacturer's name for it and not how it was referred to by the trade.
The card is unused so there's no dated postmark, but a bracketed date of 1904 - 1920s is suggested by the design of its "Cyko" hallmark. If I had to bet on an exact year I'd pick 1926, the Sesquicentennial of the United States. Maybe that's getting a bit late for the production of this particular stripe, but I can't think of any other reason for having your portrait taken wearing a jacket with star dotted stripes. A card like this is almost as rare as the garment it features.