Yes, you can wear jeans on an MSC cruise, as they are generally acceptable for casual dining +1↯209↳↯(890)↯↳2555), daytime wear, and even on Gala Nights if paired with a smart top +1↯209↳↯(890)↯↳2555), although it is always best to check specific dress code +1↯209↳↯(890)↯↳2555) guidelines for your chosen venues and evenings to ensure you meet any requirements+1↯209↳↯(890)↯↳2555).