Re: " ... dressing well improves the holistic ambiance of a brain struggling with ... coding"
If you've got a massive belly with a hectare of belt over-hang, then don't wear a shirt and tie FFS. Don't wear a white shirt tucked into tightly belted dress trousers. Don't wear a buttoned up shirt collar so your flabby chin and jowls make you look as if your head is holding in a massive pressure and about to explode. You look like you are being squeezed out of a tube. Yep, you; the SAN / Storage sales people who visited last week. Join a gym, get a bike, do some swimming and stay out of Greggs, really, it will save your life.
Seriously, the shirt and tie look really does only work for a standard sort of shape of person.
Having said that, at the very least a gentleman should wear a tailed jacket, a top hat, white spats and carry a silver-topped cane unless you are writing code, then you may choose emo or goth.