No problem! :) first, you’ll want to gather all the reference images you can find!! I was lucky with Jadesprite because there were plenty of color references on hand of her character.
Once you do that, sketch out how you want your cosplay to look! When you get that done, get that into your computer and open it up on photoshop or some other image editing software. As long as its got an eyedropper tool, you’ll be good (so even MS Paint will work)
This first time I did this, my friend patty helped me choose out the colors since we were trying to coordinate my jadesprite with her davesprite. What we did was eyedrop the colors from the image sources we had, and apply them onto my design.
As you can see, Jade’s colors change a lot from image to image, and that’s because of color theory and how colors react to different forms of lighting. In the Cascade flash, Jade’s colors are a lot more yellow toned than her basic green and white sprite in the comic, and this is because there are meteors exploding onto the battlefield, and everything is on fire.
A sprite’s color is the chat color of their alpha/beta/counterpart/guardian/son/daughter/brother/whatever. Jadesprite’s main color was Jake’s dark green text color, so her wig and any other accents I did were variations of or in his pesterchum color. And although we eyedropped Jade’s sprite color from the flash, later I ended up reworking both the design and the color into a more minty green that looked better next to the forest green. Remember. Color theory. Everything was on fire during the flash, making everything look more yellow than it actually was.
An important thing to consider when trying to balance the colors in your design is that you should integrate the colors throughout the entire outfit! I added a stripe down the side of the skirt to help with this, since otherwise there would just be too much of the lighter green.
Also make sure to keep your color palette consistent! Jadesprite’s main color (a dark forest green) has cool tones, while the second color I had selected before had warm tones. By taking away the warm tones (in this case, the yellows in that lime green) I had an overall cohesive image with non-clashing colors.
This is why the image editing software is so handy; you can eyedrop the main color from the reference images you have, and then create tints and shades from that color to create a good color palette for your design.
In your other ask you specified wanting to make a colored Tavrisprite, so i would say use John’s royal blue text color (a warm tone) to start with, and create a medium shade and a pale shade to work into your design. Try not to let your colors get too close to Jane’s cyan blue text color (a cool tone)!
I hope this helps, and I wish you luck!!