If you think about it though, May and Brendan's clothes in in games did switch to a green color scheme in Emerald version, but instead of using those designs he gave them different clothes. Red's clothes however do not change between FRLG and HGSS, at all. There is no reason to change his clothes or even make them a different shade.
But he did use those designs. But then he used those designs with different color schemes. That's why the way Ruby and Sapphire are wearing one thing in volumes 20~22 is different from the way they look in volume 28.
Which is why I think Red's color scheme could change, at least a little bit.