I’m all for being comfortable, but I think we lost something when jeans and tee shirt became acceptable business attire.
You play well dressed and trying to do your best.
I come across plenty of folk who believe this, so not saying it's wrong, but personally I think it's more a case of others perceive better standards of work when people are in smart/business attire.
A perfect example of this: a number of years back, I had the unfortunate job of having to make some of my team redundant (I work in IT in data, I had a team a BI developers, DBAs, analysts etc).
Collectively, the senior staff had to put forward the people that they wanted to 'save' from being considered for redundancy.
At the time, the office was dress down and it was a nice working environment, nice kitchen/breakout area and a fairly fluid approach to searing- you could just take your laptop on go off and work at standing desks or in the kitchen or wherever suited you. One member of my team liked to be more formal though, spending the day at his docking station and wearing a shirt etc. In terms of my team, he was actually the lowest performer and bottom of my list to be saved. Another liked to go off and sit on the floor in the corridor with the laptop on her knees from time to time, and also would be in the kitchen talking to people making coffees etc. Some of our best work got done in that kitchen discussing how to go about something or what new initiatives could be implemented to make an impact etc.
So when it came to hearing other opinions on who to save, I was quite surprised when the CEO of the company chimed in that they wanted the first guy to be saved and my best team member to be strongly considered for release.
From their perspective they saw someone smartly dressed, diligently working at their desk, versus someone messing about chatting in the kitchen. It actually took quite a lot on my side to demonstrate that the output from that guy wasn't great and he was even on a PIP (personal improvement plan). I was never able to convince them that my best staff member was worth keeping though.
🙁 Needless to say I don't work there any more....