I don't miss those days at all. In the 70s I worked as a field service technician and it was pretty much the rule we had to wear a tie at least on the initial visit to a work site and if flying, on the plane. I hate wearing a tie. Most useless garment ever invented. Jeans were obviously not allowed, but I'd push the limit by wearing corduroy pants...same cut & style, just different fabric. Never got called out on it.
Some of my worksites also had IBM equipment, and I'd often see their techs. Felt sorry for them. Always a suit, white shirt, tie, wingtips. Even working on messy stuff like hydraulic actuators. Never once saw any of them chatting with or joking around with fellow techs or the customer's employees. Strictly business. Way too structured for me.
Fortunately, by the late 70s things got much more casual. Did I mention I hate wearing a tie?

Even though I'm mostly retired now, I still do some field repair work. If it's hot I'm wearing shorts. No one has ever complained.