Dress codes depends on companies.
However General Rules as follows
Interviews : Formal with Tie (Suit not necessary - but u may wear, if you please - I would Not Recommend)
General Work day -(Mon to Friday) : Formals without tie (depends on your designation and role - you may require tie or Suite for one off client meetings)
Friday : Smart Casual.
EOI Submitted JUL 2008,EOI Selected AUG 2008
EOI Approved NOV 2008,ITA Issued JAN 2009
Application Submitted APR 2009,Visa Interview AUG 2010,Approved DEC 2010.
AUCKLAND FEB 2011