Shorts and skirts are excellent choices. You may also wear worn jeans, although this may be too warm for most people, especially if you want to walk a lot. Although slippers are really comfy, you should consider wearing shoes. Because you'll be wandering about a lot, you should wear closed shoes. You should also wear a shirt or blouse because there will be lots of opportunities to shake hands with important people. If you want to look nice but not make a big deal out of it, then wearing something formal is perfect. Men should wear suits and women should wear dresses. Neither of them wears clothes that show their underwear. If you're going to Sinulog on a weekend, then expect long lines. The event is very popular among local tourists. If you want to skip the lines, then register online first. This will give you priority registration and allow you to enter the festival earlier. The best time to visit Sinulog is between January and March. It's when the festival is held in honor of San Lucas, which is the main patron saint of masquerades. The weather is usually cool at this time of year.