Guess I might aswell post a step by step how to install.
You need AFS Explorer 2.0 and WE Picture Decoder, both found here:
http://dte-ng.issextreme.com/scripts/ps2.php
1. Right click on the image of the kit and choose 'save picture as', then choose bitmap in the 'save as type' rollout. Save the image somewhere in your PES3 folder (for easy finding later)
2. Use ASF Explorer to extract a uni0****.bin file from data.e.afs. All uni files are found in 150pl - auto - uni. The demo uses uni numbers 006, 009, 013 and 025. pa=home, pb=away, ga=gk home, etc. To find out which number referes to which team look here:
Team list
3. Using WE Picture Decoder, open the uni0****.bin you have previously extracted.
4. Click Import/Output -> Import/Export Full Image -> Import BMP
Then locate the BMP you downloaded
5. Press F2, then click set opaque. Secondly click on the colour used for transparency on the image, then move the slider bar to 128. At this point you should use the Pallette (F1) to change the transparency colour to a colour similar to its closest colour on the kit - usually the collar colour.
6. Select the pull down menu that says '0 (512x265x8) (Shared Palette)' And change it to '1 (265x128x8......'
Click Betis -> Get low res from high res texture -> Simple
7. File -> Save file
8. Use AFS Explorer to import this .bin file you just created back into data.e.asf.
9. Load PES3!
Seems like I went into a lot of detail there but I'm sure I've confused more ppl than helped
