Pack half what you think you will need. Seriously.
You don't say how long your cruise is....for a warm weather 7-day, I take:
**2 pair shorts/capris,
**two pair nicer long pants (maybe a white and a black), could sub a skirt
**5-6 tops that match all the bottoms,
**2-3 dresses. (Since you are celebrating, if your cruise is long enough to have formal/semi-formal nights, you may want to go long dress or even all out formal.)
**a couple of dressier sweaters that go with the tops and dresses
I find it useful to pick a color scheme and stick with it so everything coordinates: Black/white/Royal blue or
White, Navy blue, pink or
White, khaki, red.
Most of my clothes, except shirts, are solid color, shirts can be prints.
*1 pair walking shoes,
*1 pair dressier shoes or sandals, nude matches everything
*1 pair flip flops,
*1-2 swimsuits, one cover-up
*2 sets workout clothes (optional).
If cooler weather (like Alaska), i would leave out shorts and add jeans, make the tops long sleeved and add a couple scarves, jacket.