Born in 1962, middle class, white.
If you want a better notion of how people dressed, the Dick Van Dyke show or Mad Men is more realistic. For work, middle class men wore a suit and tie, with overcoat and hat in cold weather. Women who worked wore dresses or, more rarely, a skirt outfit. Same dress code applied when going to dinner/the theatre/social events/parties/church.
Around the house, dads would wear sport slacks and non-Tee casual shirts or sweaters. Moms wore Capri pants with shell tops that zipped up from about 6 inches below the neckline. Nobody wore jeans.
For kids: I wore dresses or pinafores to school every day until I was in about 4th grade. After that I could wear a dress or slacks and a blouse. I never wore jeans to school till I was in 7th grade. At home we wore “play clothes,” casual pants and what we called “polo shirts” which were somewhat like T shirts except with no decal, just horizontal striped fabric. Only in the early 70s did my friends and I start to wear jeans even to play in.
The work dress code prevailed all year round. At home in the summer, Dads wore slacks with short sleeved cotton shirts. Moms wore Bermuda shorts with sleeveless shell tops. Kids wore non-denim shorts with polo shirts (for boys), sleeveless casual blouses (for girls), and canvas sneakers (both sexes) or sandals (girls only).
When my parents threw parties, Mom and Dad dressed like they would to go out to dinner. Kids were expected to say hi to the guests and then make themselves scarce.
I don’t dress anything like that, of course. But it does sometimes surprise me when we are at a nice restaurant and I see people in jeans.