Would like to see TV news anchors give up jacket and tie for summer at least. Make it more friendly. June I think it increases work productivity. If you're comfortable, you'll do more. Fred Stearns First job, I wore a tie and it wasn't a professional job.
Casual dress increases productivity as it is comfortable.
I felt like I was choking while wearing a tie. Sloppy dressing promotes sloppy work habits in an office environment. I know that many will disagree with me, but a T-shirt and jeans does not need to be sloppy. I have seen street workers and yardmen wearing coats and ties along with their work boots. I think casual wear increases productivity mainly by just being comfortable.