The odd part is that they did a semi-decent job; I actually think that dress looks pretty good, even though it's still a lie and a shop job.  They really are insecure in their own culture and religion aren't they (atleast the news agency, religious leaders, and the government are--I know enough Iranians to know it ISN'T the majority of their people...).  I wonder if they had someone pose at about the right angle/height/distance with the new dress and then they literally copy and pasted it from that image.  It sure would make the job easy and most likely make it look far better (that's assuming their editing and shop'in skills are that good or insightful).

Off-topic:

As for Argo winning the Iranians actually should praise this version of the show and how it portrays history.  Argo makes you think that they "almost" caught the evil Americans, when in reality the operation went completely smooth and didn't have the "by-the-skin-of-your-teeth" incidents that were in the movie (they used Hollywood's well known artistic license quite a bit).  Still a good movie, but if you get the show on blu-ray watch the little documentary that comes with it or just read a brief synopsis of the events somewhere.  There are also quite a few books on the event as well.  The one true part from the movie that was incredibly real and nerve wracking was the two document sheets.  One of course was the top (white) original that was stored in the records/archives in case they needed to look it up or to make sure there wasn't a fabrication.  They of course only had the yellow copy sheet of the non-existent white original, so if anyone went to go look in the back-room they were SOL.  But everything went smooth (who knows, maybe an Iranian airport worker was actually a good human being that day as well, but we never hear those stories).

highwayrun:
Much faster process than going out, finding the right dress and making the photo shoot happen, and then carefully shopping the dress in, would be to eyedropper-sample the existing dress, rubber-stamp onto arms, highlight, shadow, trim excess. Done.

Oh, don't get me wrong...  I know there are lots of ways to do it I was just stating one way to do it to get a pretty accurate picture and not necessarily the easiest, but perhaps one of the easier if you do a complex one--if you understand what I meant...  I should add that easiest is a relative term when you are doing photo-shops and we're talking about the Iranian news, publications, and government press releases.  I'm not even sure they're quite capable of dealing with a complex third-party plug-in yet.

Anyway,I'm sure you're right about how it was done as the picture was released fairly quick and doing the sample/stamp method is pretty damned fast and newbie easy (BTW, the way I'm talking about doing it isn't anything like a photo-shoot or near that complex; you just get a dress get it in the right angle and setup with about the right light and take a picture...it could be on a hanger for all I care--everything else happens in editing of course; BUT I've never tried such a thing so for all I know it would end up taking WAY too much time to even bother with and it also has no guarantees of quality either...).