Another van Trapp post, but this time the original choir. Nice short sailor suits. Unknown colors, maybe very light blue or green? Aired on Jul 3 1960. Full episode on YouTube by What's My Line?. What's My Line? - Trapp family choir; Tony Randall [panel] (Jul 3, 1960).
https://sailorsuitsandlederhosenfilmblog.blogspot.com/2011/08/die-trapp-familie.html
https://sailorsuitsandlederhosenfilmblog.blogspot.com/2011/08/sound-of-music-1965.html