I've seen this damn grayed out button in my equipment screen for ages and wondered what it was.
And now just a few minutes ago I see this post on tumblr:
As well as a custom hair colour coupon, JMS has a hairstyling room where you can save up to 3 hairstyles and switch between them at will (though access to the hairstyles only lasts 30 days, then you have to buy another coupon, but apparently they are super cheap)
Do you think we will get a system like this in GMS? since we have the button for it already.