@engineer,
Quote:before Covid, office attire was "business casual", so no jeans.
i can only speak of my experiences in the engineering world (design group), having worked there since the mid-80's.
i started in NYC, and recall wearing polo shirts with khakis right away.
at a different job in the late 80's - early 90's, i wore a shirt + tie, sometimes with "nice" jeans, occasionally with a suit coat.
by the mid 90's i was working in bahstin, and we wore shirt + tie with khakis, no suit coat.
sometime in the late 90's, "casual fridays" started... i think it was summers only... hawaiian shirts or polos, jeans + sneakers.
i think by the year 2000 i had stopped wearing a tie for good.
in '01 i changed jobs, and started wearing jeans when i felt like it... sneakers were fridays only (personal rule), but others
wore sneakers throughout the week...