I've heard a rumor tha HAL is easing up on the Informal nights or eliminating them completely. Is this true for their 10 night Seafarer/Wayfarer sailings? It would be a major change to packing if no sports jacket and such was needed.
Informal nights have always required a jacket, no tie, for men, but whether they are easing up on this I have no idea.
On Informal and casual nights, my husband wears the same type of clothes, just adding the jacket for Informal.