Although the armor set you are looking for has a recolor that is available to purchase with gil, the problems you mention are especially prevalent in current endgame dungeons where the gear is fantastic-and chests/bosses drop even less of it in favor of accessories.

Even if I have to run a dungeon 10-15 times to get enough tokens for a specific piece, I would much rather do that than grind endlessly with no hope of an end in sight.