that's actually pretty easy, you just need to change the tint files for the scarf. that's a matter of changing the color of the tint, from memory (this was ages ago) but i think cloth was red and say, cloth 2 was blue. if you want those two piece of clothing to be different tints, then make sure the tint file is two different tints.
additionally, to have that color you need to hex edit the ebx files, this is moderately harder than simple texture editing.
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https://www.nexusmods.com/dragonageinquisition/mods/1937/?
I know this may not be easy to achieve, but could you try getting this look?
https://media.playstation.com/is/image/SCEA/dragon-age-inquisition-screenshot-05-ps4-us-22jul14?$MediaCarousel_Original$
I particularly like the way the collar and scarf are different colors. Possible? Don't know, I have never figured out how to mod DAI textures...
additionally, to have that color you need to hex edit the ebx files, this is moderately harder than simple texture editing.