The skin would not be so simple for Zos to make as it would have to work differently for most to like it.
Currently skins change the appearance of a characters skin to a specific look that is exactly the same for every single character that uses it.
What players have requested, amd what many has replied to here, is a skin that returns the appearance of the character back to their original appearance amen that would be a different technical challenge.
So first Zos needs to be willing to offer it and they may not due to their vision for the game. Second, they would have to figure out how to do it and determine it iS worth the cost. Yes, I know everyone is an expert on the subject even though they are not programmers but it ,igniting not be as easy and cost effective as one might think.