I am looking at transatlantic cruises as an alternative to planes and while searching and reading about the topic, I am wondering about dress code. It appears that many cruise companies offer luxury or semi-luxury cruises which involves people to dress up some evenings or even all evenings.
I am not really into that and I was searching for cruises letting me go around with jeans all the time. I am wondering how to restrict my searches to this kind of cruises. I for example found that Costa offers some transatlantic cruise that involves dressing up some nights in the main restaurant but you can escape and go to a buffet restaurant at no extra cost.
So I am targeting these cruises that let me go around with casual clothes like jeans at any time, even if I have to avoid some parts of the boat some nights. Is there a search engine or a way to find these (by sticking to some specific company for example)? I am mostly interested in transatlantic cruises (i.e. North America to Europe).