I had something like 35 heroes (maybe more) I played and 10 were like my 'main' ones.
But I rarely changed costumes on most of them so out of 35 heroes (or more) I have only saved about 8 costumes and 5 are alts from only one hero.
Mostly everyone else I had to go and recreate all over and save in the offline Icon.
Not a huge deal but the lesser used ones I can barely recall what they looked like.
Did you save them with Titan Sentinel or make a demo recording of them? If you did, there's good news and bad news.
Good news- Xenos worked out how to translate (http://www.cohtitan.com/forum/index.php/topic,8600.msg122205.html#msg122205) the information in to a proper costume file!
Bad news- It will take you quite a while to do each costume.
Good news again- we might have some sort of automatic conversion on the way.
If you didn't save the characters... :( You'll have to see if you have some screen shots and go from those.
Hindsight is a mofo.
ALways play as if it's the last day of it being live.
If that urge to take a screen shot comes, dont put it off, do it.
Are the costumes stored in some way in the export files that we created when we exported toons at the end?
I did get screen shots of all my costumes and I saved most them ingame, but there were a few i missed.
If you are referring to the Sentinel Program, you can make Demorecord files from them. We have also (thanks to Xenos and Arachnion) worked out how to manually create a .costume file from a Sentinel file. We may have others working on an automated version as well. For more info, feel free to dig through the "Costume File Formats" thread in this subforum.