Hi - to my knowledge yes it is mate, just took this from the Feb patch notes :-
•Learning Styles •The primary way to learn Outfit Styles is by reading Motif books and chapters. In addition to unlocking the ability to craft in that style, learning a Motif now also teaches you how to apply that style to your Outfits.
•As this Outfit Style knowledge is an account-wide collectible, learning how to craft helms in the Glass style (for example) on any character allows you to use that to override the appearance of the helm slot of any Outfit on any of your characters.
•These style collectibles are retroactively unlocked for all the styles you already know how to craft after logging in with a character with the associated Motif knowledge.
•In addition to Motifs, completing the “Soul Shriven in Coldharbour” quest awards a set of Prisoner’s clothing styles, and you can expect additional unique gear and weapon appearances to become available in the future as well.