I feel like this is very unlikely given the spaghetti code and the small population it would help, nevertheless....
I am red-green color deficient (the more severe kind of that), and have a lot of trouble with the costume creator colors. In most cases it doesn't matter as I will pick a color that just looks good to me, or one that I have no problems seeing. That said, it would be nice if you could get something like the name of the color when you hover your cursor over it in the grid. There are some cases where I would like to pick, say, a green and know it actually is green. My main on live was supposed to have black pants with yellow leopard spots, and it was two years before someone told me they were green.
I feel like it's worth at least mentioning since 7-10% of all males have some sort of red-green deficiency. A lot of modern game design (and just general world design) takes color-"blindness" into consideration, so why can't we? Again, I assume the game code would make that too difficult, but even a mod would be nice. Heck, I (and I imagine others) would appreciate just a document you could open outside of the game that labeled the colors in the grid.