No restrictions at all. You just need to find/buy the style motif for a race to be able to craft and wear it.
Lag is ruinin' my 'mershun! A society grows great when old men plant trees whose shade they know they shall never sit in. There is only one good, knowledge, and one evil, ignorance - Socrates Member of the Old Guard, keepers of the game's history
You will also be able to craft you own races armours from the start, however to craft other types you will need to learn the motifs.
@Turelus - EU PC Megaserver "Don't count on others for help. In the end each of us is in this alone. The survivors are those who know how to look out for themselves."