I hate it, but I finally caved and bought a 'real' suitcase, with a foldout section for my suit. It gets a couple of wrinkles, but following runningshoes' instructions should work - I just put the hangar on the door when I have a shower

. Some hotel rooms do have trouser presses, but they aren't much good for jackets.
I have actually traveled with my suit in a backpack, but the results were not quite as composed

.
Good luck,
Dr. PITUK