I thought socks are white no matter what

No one here can 'fix' this. You're better off asking Mabinogi forums. That is if it is a visual glitch or whatever.

But I think at one point someone explained that some times the sock colors change depending on whatever you dyed the main part or whatever.

I see, thanks, it's gonna be years before I can get a white dye, but at least there's a possible solution to it.

I don't think you have to dye it white.

If I recall correctly, when I had the outfit, mine socks were white despite the overall part being purple. I assume it just does this for specific colors though.

i.imgur.com/BmawGzT.png

Disregarding the money that I could have not wasted by dying it not black, I think that solved the problem, thanks.