The rakshande armor, specifically the arms keeps reverting back to its orignal color. Its some kind of graphical bug because the dye color on the dye window is staying at what I put it as but any time I unequip a piece of gear (even rings) or any change with my character occurs, (dying, mounting horse, processing.) the arms shift back to the costumes original color.

I don't know if this is a maewha problem or a costume problem. 

I have the same Issue on my Maewha

it seems to be a loading issue only. I had that on my Sage just now.

The color was still applied, but the model had the default color. The default color was only in the game world, not in the dye window. (Char in dye window had the color applied correctly)

I have the same problem with always on the same body part ( Glove ) like OP have too.
Here is a video.

Yeah, I have the same problem on my witch :(

I'm having the same issue with my Ninja Aegis costume. The dye settings are correct, but it loads the default colors on some of the body parts.

Also just tested my Warhawk outfit and the helmet also reverts.

Same thing happens to my Ranger's Pieris Armour boots

Same problem on my valk nearly every costume! Mostly the part which colors the gloves.

This issue with colors not applying, was already reported and is being investigated.  Please stay patient ^^ eventually they will fix it. 

Having the same issue on all my characters, very annoying.