Princess cruise dress code?!?

That dress would be just fine for formal wear. Anything from prom to tail dresses and even nice pants with a sparkly top is fine too. For other dinners, I myself have worn jeans myself, but only real nice ones with a nice top. I also wear other pants or a casual dress to dinner. I would not wear ripped jeans, a tank top, shorts, or flip flops to dinner. Other sandals are fine, but since you are going to Alaska, sandals may be too cold. Flats would be good or a high heel like with a kitten heel would be great. I often will wear the same pants more then once, but with a different top because you are limited as to how many suitcases you can bring on a plane now. Bring some fun jewelery with you and mix it up. You will have a wonderful time in Alaska.