I will be on my very first cruise on Celebrity Apex to Norway in early May 2025. From some research I have gathered I will need to bring clothing that can be layered and definitely outerwear that is warm and waterproof for excursions. My question is ,what is the temperature inside the ship ,ie in the dining room ,buffet, theatre etc . I come from a warm climate and I am wondering if jeans and a long sleeve top will be sufficient for indoors or will I need something warmer . 20 degrees is already chilly for me . TIA.