Maker labeled 20s dress and value ?

So I have a 20s dress w/ a maker label - grace m. Blanchett modiste. I cannot find anything online.

My dilemma is that the attached hip bow may be a smidge lighter than the rest of the dress. I think that dying the bow a contrasting color would make it look more interesting in my humble opinion.

But, Do unknown maker 20s dresses have any provenance/ increase in value over unlabeled ones?

 

I found this information about an Oregon dressmaker named Grace M. Blanchett, who worked at that career around the time you say your dress was made:

-- Grace M. Blanchett was born in Oregon in 1905.
-- In the 1920 census she had no occupation
-- In the 1921 Pendleton OR city directory her occupation was recorded as "student".
-- The 1925 Pendleton city directory lists Grace M. Blanchett as employed by Hays & Blanchett. If you then look up Hays & Blanchett in that same directory it says they were dressmakers (see images below).
-- Grace Blanchett was not in the 1928 Pendleton city directory although Stella Hays was still working in women's apparel.
-- In 1928 Grace married Kenneth P. Morrison
-- In the 1929 Portland OR city directory Grace Morrison was listed as a dressmaker. (Note: She was not in the 1928 Portland directory)
-- In the 1930 census she has no occupation and she was not in any Portland OR directory between 1929 and 1932, so I guess her dressmaking career was short lived.
-- Grace Blanchett Morrison died in 1980

A photo of her from her 1921 high school yearbook:



From the 1925 Pendleton OR city directory:


Also from that 1925 city directory:


From the 1929 Portland OR city directory: