Normal church dress is fine for Sunday morning. Expect very hot weather in Pasadena on the outside and very cool air conditioning on the inside. Pasadena can be very smoggy in the summertime. Keep in mind that modesty throughout the summer is always the best policy. Neither Training Camp, nor your summer site is an opportunity for fashion.
Simplicity is a good rule of thumb.
Bring the addresses of those who have supported you financially and prayerfully . . . Even if you send them a letter and it doesn't arrive until after you get back, it will still be valuable. You should now be well into your own personal journey of preparation for this summer's Youth In Mission assignment. Each minute you put into spiritual preparation, as well as site research, will be worthwhile. Each Nazarene college campus has a coordinator.