User blog comment:ChishioKunrin/Yang and the Color Purple/@comment-71.175.63.159-20170625011408/@comment-4010415-20170625015936

That is a good point about the similarities in styles between their outfits, though Blake's volume 2 alt outfit had pants instead of shorts and didn't appear to have a shirt under the coat.

As for the yellow/gold on Blake's outfits, her volume 4 outfit also has gold on the belt that goes across her chest, a couple gold circles on the collar of her coat, gold on the belt around her waist, gold trim on the pouch on her hip, and gold on the belt around her left thigh.

That said, though, Blake didn't really have any gold on any of her other outfits. Her volume 1-3 main outfit was black, white, silver, and purple. The little kimono she wears as pajamas is black and white. Her volume 2 alt outfit was black, white, purple (including the soles of her boots), and silver (the buckles on the belts around her boots). Her dance dress was purple and black, with black heels and a teal bow. Interestingly, in light of this discussion, I wonder if it says anything that Sun wore a black shirt to the dance.