In a quick look, I did not found a lot of information about Charles of Miami, but it seems that they made sweaters/wraps for younger girls:
-- An ad from 1957 touts a Charles of Miami "...soft Orlon bulky (sweater) with lacy border" for "young Christmas carolers."
-- A 1961 ad for Charles of Miami sweaters notes that they are "Glamour-Wraps for young sophisticates."
-- A 1964 ad features "warm and kitten soft" 100% Orlon acrylic sweaters "for a good little girl."
I also found a reference to a 1965 letter from William Friedhofer, president of Charles of Miami, written to government officials who were considering legislation about labels identifying country of origin of textiles.