From Kolchak: The Night Stalker, S1:E1, September 13, 1974. Nobody at the network said, “Hey, put a top on that girl”?
The complete 20-episode series on DVD, minus the two earlier TV movies, is only $11.55 on Amazon. Video quality is very good, compared to the copies MeTV has shown.
https://www.amazon.com/Kolchak-Night-Stalker-Darren-McGavin/dp/B01IP2X718/