Regarding clothes, don't make the mistake of packing clothes for "special occasions." The sight of pilgrims on the Camino dressed in their pants with zipper off legs and quick dry t-shirts is the norm. Nobody will give you a second glance. When entering churches be sure to be respectful--especially if there is a service underway. Don't take flash pictures unless you are sure they are allowed. Otherwise, the locals are more than happy to have you come in, sit down, and gather your thoughts and give thanks to God for safe passage.