As the title says.
I believe this to be a very annoying bug since it seems that removing layerwear (whether it be base or outerwear) and re-equipping it in the salon seems to remove any customized color and reverts the clothing to its default colors. There are some cases where the customized color will pop back on after removing and re-equipping a second time. But I can see this bug causing some frustration, since it actually costs color passes to change the color of clothing.
Hope this gets to be fixed upon release!