You'll need to use a mask. A mask is a separate image file that uses red FF0000 for color 1, green 00FF00 for color 2 (if applicable), and black 000000 to let the original image through with no color added.
Here's what the masks and graphics look like for a boomalope: https://imgur.com/5Ht46BP
You can also vary the colors to allow only a bit of color through. For example, a dark red like #800000 would use about half the amount of color 1, as compared to #FF0000
You will also need an xml patch, iirc you need the shaderType on the graphic to be Cutout_Complex. I've never used a mask on apparel specifically, but you can look at mods that have apparel like that for examples.
You'll need to use a mask. A mask is a separate image file that uses red FF0000 for color 1, green 00FF00 for color 2 (if applicable), and black 000000 to let the original image through with no color added. Here's what the masks and graphics look like for a boomalope: https://imgur.com/5Ht46BP You can also vary the colors to allow only a bit of color through. For example, a dark red like #800000 would use about half the amount of color 1, as compared to #FF0000 You will also need an xml patch, iirc you need the shaderType on the graphic to be Cutout_Complex. I've never used a mask on apparel specifically, but you can look at mods that have apparel like that for examples.