I'm surprised at the number of people whose Mother's made their clothes too.
Like your Mom, my Mother worked outside the home. This was in the l950's. It was frowned upon for women to work outside the home at that time, but that didn't bother my mother
I don't know where my clothes came from, but probably the name brand department stores. In HS I had 5 or 6 different outfits which I wore all school year. That was it and it worked out fine because most of my friends were the same. No one had closets full of the latest fashions in our home town.