There is of course the option of (gasp!) ironing your suit at your destination. Pretty much every hotel will either stock an iron and ironing board in the room or send them up to you if you call housekeeping to ask for them. I'm a dedicated carry-on-only traveler, squash my clothes unmercifully in my 20-inch rollaboard, and just iron things at the hotel before I need to wear them. It takes maybe ten minutes.