But if you do take a tux, which I will when there are FORMAL nights, I think I will still always take at least one other jacket to wear in Signatures (and maybe Prime 7).
Your comment on the 7-day Baltics cruise has me totally confused. For our cruise in August, there is one Informal night the second day, which I assume will be the Captains Welcome Aboard. All the rest are Country Club casual. Again, personally, I may take a second jacket for Prime 7 and Signatures. But I just checked the 7-day Baltics cruises for next year, and I think they are totally Elegant Casual, so I wasn't sure to what you were referring when you said something about 3 out of 7 nights are Formal??
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Eugene