Searching US TV movies of 1980 on IMDb, I quickly found this movie. Baseball movie starring John Ritter.
Unfortunatley only one notable and brief scene at the end. And obviously not available on DVD either.
Next to the boys and girls in yellow, red, white green and maybe other shorts also this young woman in light grey shorts.
Available on YouTube but in a very bad image quality.
Still rating (8)-9.
Please also note my previous entry (orange and green shorts rating 8).