Some time ago, I checked almost all 458 episodes of this Argentinian series for my bib overalls blog. I don’t have the time to recheck all episodes. The boys (and sometimes girls) wore at least ~4 or 5 different Soccer shorts + swim shorts. Although a Soccer series, I think there’s less than half of the time Soccer shown.
I think they mainly wore shorts of the brand Umbro (mainly medium blue and white ones (pics 2+4, main entry pic 1). The logo is a diamond and text Umbro underneath and a horizontal diamond band at the legs and a thin stripe above.
Pic 1 showing them sitting in plain white shorts of brand Olan in ep 252, another pic in the main entry. The logo is shown in pic 3. Also in plain black shorts and shirts at the beginning of ep 222. And black shorts with many little white and red diamonds in ep 386.
Later in ep 222 the other team wore different black shorts with 2 horizontal stripes and black shirts (pic 5). To me the logo says “Power” but not sure (at least starting with “Po”). I haven’t found this brand (maybe no-name brand or sponsored?)
Also other shorts with 3 and 2 horizontal stripes on the legs. At least one more post coming soon also showing young girls (Basketball) and a man in purple shorts. Unfortunately, the second half of the series is only available in a very bad image quality. Main entry, rating 10 at