PCOS thing remake on the road, but... (Patreon)

I’m making the remake of PCOS things, and I’m pretty happy about the result (I made light, medium, moderate and severe textures), BUT there’s a problem: the area around the underwears is pixelated. I tried to change the composition method, but it obviously changes also the appearence of the hairs, and they are not so good.

I noticed that in the EA hair, in GIMP, there are the RGB channels, meanwhile my hairs only have alpha channel. I think it could be that, but I honestly don’t know how to add them. The RGB channels are there, but they don’t have the drawings...  🤔