Yo mate. In a thread, i cannot find now due to broken "search button", you talked about an image format different than png, that works better inside PES 2021. You gave a Porto Kit as an example.
I have similar issue, i've created a special kit for Paris FC for my ML, but the light blue scratch effects, in Red/Crymson body parts, inside PES 2021 game in PS4 are depicted as Glaring Red/Crymson Red in Red backgrorund, basically the image is not depicted as it is on PC.
I attach the sample format, as i am not allowed to post full kit, my original is 2048x2048 PNG.
View attachment 1139
The image format is .dds, I've done some more testing since then, and it's not always better (sometimes the colors can get a little weird when you go from png to dds, but that's exactly what happens in PES as well), but when you save in dds format you can more or less preview how the kit will be in-game and avoid these annoyances. I think dds is better when you have kits with these kind of fine details, thin lines and stuff like that.
The original thread is here btw: http://www.pesgaming.com/index.php?threads/importing-kits-in-dds-format.105598/#post-2230782