There's probably more than just these but the candy twist wigs from Morostide 2021 are half and half.
Not sure if you want mainly black/white but here are a few misc colored ones:
CWs: - some recolors are in this sort of color combo (not quite half and half, but two-toned) but not all - this is the only vertically split color I think
If you want two-toned but not strictly split dyed styles, there are also these:
Oh no, any colour/colour is fine, those are awesome thank you ^^
so many to choose from! thank you ^^
Oh that's awesome, thanks!
I've tried to only inlcude items with very distinct two color patterns. I have not included item likes the ones below - streaks, more than 2 colors and bits of hair that could be added to mono-colored wigs to make a two tone wig.
In loving memory of Need posting achievements?Then join Posting Frenzy Achievement Items - searchable list List of Borders and cutouts New at Fresh and Flavorful Ping Group
There's also :)