I'm trying to color the left half of my robes just like my reference image. However, I can't seem to do so since my robe is mirrored. Is there any way for me to apply my colors without re doing the entire robe? Thanks
You could Apply the mirror Modifier, which would then give you a complete mesh that has both left and right sides, and apply the "uncolored" material, and also add a second material "colored". You would then want to select all the faces on the left (?) side of the mesh and create a "left side" vertex group where you could Apply the "colored" material. You might first duplicate the robe to keep a backup of the original half robe with Mirror Modifier, should you need access to this in the future.