According to the patch notes, dye information is only kept if the glamour piece is part of a plate, meaning if you use an expensive dye (black/white) you would have to either take the loss and reset dye information if you feel like changing that plate, or permanently lose one of your plates just to keep that gear piece in a plate.

Why isn't this dye information stored in the dresser as well? This is extremely limiting. You basically can't ever take advantage of this system if you ever plan to use jet black or pure white.