The advent of the Model T Ford helped to give birth to the automotive aftermarket. The car was so basic, and so many of them were manufactured, which in turn gave inventors and manufacturers a ready market for selling accessories to the Ford owner. The Ustus Limousette was a set roll-up side curtains that could be added to a touring car or roadster. In under an hour the devices that worked under the same principal as the old-fashioned window shade could be installed to make your Ford as snug as a bug in a rug.
Great idea, but we can see a few negative points: It is likely that the top could not be put down after the installation; the transparent portion was probably made of isinglass, a semitransparent material formed by cleaning and drying the air bladders of fish; this material and early forms of clear plastics used for side curtains had a short life and soon became brittle and cracked resulting in a short life for the curtains. Ads promoting the curtains were found between the years of 1919 and 1923. You can view more Model T Ford accessories here.