White and purple (along with green) were official colors for the Suffragettes: according to The Telegraph, Pethick Lawrence, the honorary treasurer of the Women's Social and Political Union established the colors as such back in 1908.
In particular, purple held special meaning as "the royal color," standing "for the royal blood that flows in the veins of every suffragette, the instinct of freedom and dignity."
Contrasting with white standing for purity and green standing for hope, purple standing for dignity is a concept nicely in line with Clinton's incredibly gracious and inspiring concession speech.
Clinton wore an impeccably tailored pantsuit with strikingly purple lapels paired with a purple blouse, and her husband Bill Clinton wore a purple tie to match. Running mate Tim Kaine's wife Anne Holton also wore a long purple vest (though Kaine himself went for some good old fashioned Democratic blue stripes, tie-wise). During and after the speech's live broadcast, a few other members of her campaign could also be spotted in various shades of purple. (source).
Clinton wore an impeccably tailored pantsuit with strikingly purple lapels paired with a purple blouse, and her husband Bill Clinton wore a purple tie to match. Running mate Tim Kaine's wife Anne Holton also wore a long purple vest (though Kaine himself went for some good old fashioned Democratic blue stripes, tie-wise). During and after the speech's live broadcast, a few other members of her campaign could also be spotted in various shades of purple. (source).