@irishanon
there is no particular dress code for the ceremony. once u reach the venue, u wud b headng to the registration counter (counter no. will be mentioned on the letter of invititation along with date and time of ceremony). at registration counter u wud b handed over with a folder, it wud comprise of ur cert of naturalization, oath statement that u wud hav to take durng ceremony (so u dont hav to learn it by hard, just read and say), few more papers. thy wud make u sign a statement.
u will have ur cert of naturalisation before u proceed for oath ceremony. aftr ceremony, complete the application form for passport and send all relevant doc to the dept via passport express. it might take upto 3 weeks (all inclusive) max for ur passport. u will get all ur original documents, tht u enclose, back with ur new irish passport