On the Sun, which night is "formal" night?

[Oboedot]

Can someone please tell me which night is formal night? The question might sound odd - but I'm thinking of taking a skirt that fits just right - if the formal night is later in the cruise, I'm afraid it won't fit any more! Thanks!

[maryannha123]

Formal night is Sunday--your first day at sea. That should work out for you!

[C 2 C]

And second last... the big Alaska send off...