Great stuff
@Bruno Passarelli, really glad you've got into editing so deep now.
Hope one day you can come up with something for the 21st century as well (personally when I started watching football).
In any case, here are a couple of points:
1. Short shorts - do we finally have a working model? Can they be assigned to specific teams (e.g. just 1980s and not affecting 2000s)?
2. specificstadium, specificpitchmowpattern, etc. - personally I try to assign as many things as possible before I need to overwrite every file before each game (or extract/select), so maybe it would be a good idea to add specificX files to your downloads?
E.g. specificpitchmowpattern_teamid_tournamentassetid_stadiumid_textures.rx3 - here you as the expert in this area could add a pitch mow pattern most commonly used for instance during WC 86, then additionally the pattern for WC 86 at Azteca, then the pattern WC 86 at Azteca by Brazil/Argentina/England, etc. as much as the passion goes.
Similarly, with stadiums - we can have specific stadium model and textures assigned for different teams and tournaments, but we can't have specific glares or specific crowds, so e.g. with Stadio Olimpico, as long as you don't change the crowds and glares, we can a Stadio Olimpico from WC 1990, a Stadio Olimpico from Euro 1980, a Stadio Olimpico from Euro 2020 even (idk if the stadium model itself has changed since then, but that's how I do my mods now - e.g. Allianz Arena always have the same crowd and glares files, and then there are specific versions for the model and textures for WC 2006, Euro 2020 and FC Bayern).
That way whenever we launch different tournaments/decades/eras, we can have (at least some) specific atmosphere automated before we go about replacing default nets and overwriting files (if we want).
Hope my rambling made some sense. Keep on the good work