In the book "Bill Gates Speaks" there is funny old story about negotiations between Microsoft and IBM.
In the first day of the meetings Bill Gates and others from MS show up wearing casuals while IBM guys come in with black suit and tie. Next day MS guys all have suit and tie while IBM guys are wearing slacks and cotton shirt to blend in.
That remembers me of the one occasion I showed up at meeting with a supplier in shorts and flip-flops. Things is, that was
during summer at 30+° C the office dress code up to Directors. And than I forgot the meeting. When I was reminded by outlook it was too late. Still kind of funny to be there in the meeting room and sitting opposite a bunch of guys in suites and ties sweating their a of.
One side of me always wanted to do something like that. I just would have never done it intentionally. But in the end, nobody cared.
In the first day of the meetings Bill Gates and others from MS show up wearing casuals while IBM guys come in with black suit and tie. Next day MS guys all have suit and tie while IBM guys are wearing slacks and cotton shirt to blend in.