Step #1 of packing is decided what to bring, and a little pre-planning can go a long way in making sure that you don't spend half your trip ironing and steaming outfits.
As Julia explains in the video above, it's pretty easy to spot high maintenance items before you pack. Hang your garments, and scrunch a bit of fabric from each in your hand. If it's still smooth after you release it, it'll be smooth when you unpack. If it wrinkles up almost instantly (like the cotton dress shirt), it's probably best to leave it hanging in your closet.