Caribbean Prom What Should I Wear On Formal Night On A Cruise?

What Should I Wear on Formal Night on a Cruise? - caribbean prom

What should I wear the formal night on a cruise? I'm going on a cruise on the Carnival Glory in the western Caribbean and there are 2 formal nights. Should I wear something glamorous, like my old ball gown, or if something like this

http://cgi.ebay.com/Elegant-Sexy-Lace-Cr ...

or

http://cgi.ebay.com/Elegant-Brown-Halter ...

be in order? Since there are 2 nights at home, I use the same, or I should wear different clothes every night, 2 / clothing? Furthermore, should "do" her hair in two nights? Thank you for all these answers!