/cgl/ - Cosplay & EGL

I've seen dozens of tutorials on how to ombre dye fabric from white to your chosen colour, but is there anything I need to keep in mind if I want to do a gradient between two different colours, like either of these two examples? Should I just dye the entire fabric the lighter of the two colours and then once it's done dip-dye like you would normally according to those tutorials, or am I missing something important?
Obviously I'll test it out a few times before trying it on my nice fabric, but I don't want to waste a bunch of time and money by not knowing what I'm doing first either!