My grandfather was a barber in Massachusetts during the Great Depression until his death in 1965. Somewhere along the line, barbers unionized, and it was part of their contract that Mondays were off for them. I actually remember seeing it written on the back of his union card when I had to clean out my grandmother's house.
We also had Blue Laws back then, so on Sundays everything was always closed. That gave them two days off. Most beauty salons were the same. MA did away with Blue Laws eons ago and along came franchises like Supercuts, etc. , and soon most places were open all the t