As there are many unique requirements for rooming, boarding, and working months at sea, your interviewer is trying to determine whether you have a full comprehension of what the shipboard lifestyle working looks like. As detailed on their FAQs page about shipboard jobs, they explain that "As a team, we like to project a consistent and professional image; therefore, we have carefully chosen a uniform for most positions. Uniforms will be provided onboard and there are some uniform items that are considered personal items crew are required to pay for. Your recruiter or hiring partner will discuss this with you in more detail." Royal Caribbean International has a dress code for a variety of reasons, inclusing ensuring their crew can be easy to identify, especially concerning issues surrounding safety.