Today, I believe I have beaten that record. 3 hours in Photoshop, and the differences between the "before" and "after" outfits are so small, I doubt you'll even be able to notice them.
What a dork I am. Still, the new version is almost identical to an outfit that real-life kasson has now. I think the 3 hours were worthwhile...
Edit: For those playing along at home, there are 6 differences. Can you find them all?! ;)
Edit 2: More lunacy! for which I blame meeping. SimFreezepop do Cosplay.