filmcity
Tarmac
Now, wear the jacket onto the plane. Ask them to hang it in the garment closet. Retrieve when leaving. Hang up immediately when you get to your hotel.
End of story.
This part is also not very easy if one is flying long haul ( say 15-16 hrs ) in economy class. Flight attendents in US airlines usually refuse saying that they dont have garment closet.
True. But if you don't have a garment bag, I would still prefer to wear it onto the plane. You can wait about 30 minutes, then get up and put it on top of bags in the luggage compartment.
If you absolutely must pack it, here is a good way to avoid as much creasing as possible:

Most of the wrinkle-free shirts these days all work well. If you are on a budget I would highly recommend Lands' End over Brooks Brothers. Pack 2 shirts, your best one, and your best wrinkle-free just in case.
I would not recommend a "wrinkle-free" suit. They are bad quality and look cheap.