As you say, its a pretty old term used, since the printout paper itself resembles a classic blue and white striped pajamas. Pretty much disappeared in Swedish u

As you say, its a pretty old term used, since the printout paper itself resembles a classic blue and white striped pajamas. Pretty much disappeared in Swedish use since the advent of computer monitors. But I recall my grandpa, who worked at a big Swedish bank during the same time period, using the term in reference to any striped paper.