Stinks, but yes. Last year one could freely change kits, badges and other things using someone else's OF. There is a BLUS base OF that I tried and guess what - same result, my new kits would save as 'uniform data 001' over and over again. I believe it's KONAMI'S glitch of unfinished product. I could be wrong, but I have tried different options and end result was always the same. Maybe KONAMI knows that there is a problem in editing mode and will try quietly fix with the new DLC in November. I know it is frustrating my friend.
There is a possibility, although it's complicated: copy the files of the existing OF, in order to get all the shirt files (don't copy the OF itself!!). Then create an new user in the PS3 menu. Copy the shirt files of the original OF. Start PES 2014. Create a new OF. Now the new shirts, for example of the national teams will be added. Finish PES 2014. Copy the newly created shirt files. Change back to Your original user and copy the new files. Now You can use them with the rest of the existing files.
Or just wait for new OF..