This feature is new in the Solaris 9 9/04 release.
The following new Unicode locales have been added to Solaris:
nl_BE.UTF-8 (Belgium Flemish)
nl_NL.UTF-8 (Dutch)
ar_SA.UTF-8 (Saudi Arabia)
el_GR.UTF-8 (Greece)
pt_PT.UTF-8 (Portugal)
The new locales are available from system login.