It's an interesting one.
When 'Red' arrived, it was all open-neck shirts, smart casual. I have the pictures saved somewhere. Suits and ties were not the most comfortable kit to do the job in, so, thumbs-up for 'Red'.
When our unit was involved in re-location, the 're-location team' arrived to 'assimilate us', all smartly turned out in purple polo-shirts, with an outline of the new work-place embroidered in silver. Very smart.
At the old workplace, an employee who became the training manager wore shiny shoes, chinos, and a shirt and tie.
On his return to operational work, trainers, a tee-shirt and what can only be described as 'builders pants', (baggy, misshapen trousers, with pockets for construction tools), were deemed appropriate.
At the new unit, a supervisor frequently came to work dressed like a 'schoolboy'. This would not be allowed in a bank, retail-outlet, airline, or on the stock-exchange or in a council/parliamentary workplace, etc.