Step 7: Step Seven - Lay out what you will wear while traveling
Always have a jacket or a shirt with good pockets - especially pockets that close, zip, velcro or whatever. You will be keeping a passport, a plane ticket, a wallet, etc. with you - despite being required to take off jackets going through security screening. Putting these things in a jacket, zipping the pockets shut, takes away the worry that they may fall out.
If you wear glasses, be sure to pack a glasses case on your person. Even if you don't plan on it, you probably will doze a little on the flight or the ride - you don't want to wake up with your glasses twisted like modern art. Keep them safe.
If you like to wear sandals like I do, but want to bring a pair of sneakers on the trip - wear the sneakers and pack the sandals. That will save you a lot of room when packing.