What is a one-sentence summary of the following article?
Many cruises have strict dress codes that require you to wear certain things to get into restaurants, clubs, and other popular spots on the ship. Call the cruise line or visit their website to find out if they have a dress code before you start packing your bags. Even if there’s no dress code on your cruise, take a look at other cruise line’s dress codes to get an idea of what kind of clothes you should pack. Bring shorts, summer dresses, t-shirts, and sandals if you’re going on a warm-weather cruise. Pack comfortable sweaters, khakis, jeans, and sneakers if the weather will be cold. Opt for loose-fitting, comfortable clothes that you’ll enjoy lounging in. Pack workout shorts, tank tops, and t-shirts. You should also bring a pair or running shoes and extra socks to work out in. If you know you're going to be swimming a lot, bring multiple bathing suits with you. That way if one of your bathing suits is wet, you’ll have a dry one to change into. Bring comfortable shoes like sneakers, sandals, and flip flops for when you're relaxing during the day. Pack at least 1 pair of nicer shoes, like dress shoes, flats, or high heels, for evenings when you want to dress up. Some cruises have formal nights where everyone dresses up. You may also be required to wear formal attire to enter the nicer restaurants on the ship. If you know you’ll only be dressing up once or twice, one formal outfit should be enough. Pack a formal dress or suit. If the dress code is black tie or there’s going to be a black-tie event, pack a floor-length dress or a tuxedo.

Summary:
Find out if there’s a dress code. Pack casual clothes for when you’re relaxing. Bring work-out clothes if you’ll be using the gym. Pack a bathing suit for the pool. Pack multiple pairs of shoes. Bring along a few formal outfits.