Polos can go to hell. I usually wear nice jeans and a black t-shirt to work (but then, the CEO appears to be wearing bright orange shorts), but if somebody said tomorrow "jdpage, we need you to dress a little more professionally", then I will come in the next day with a full button-down shirt. I've never met a polo that's as comfortable as a decent button-down.

You can wear a tshirt and yet look professional. I think OP used the wrong example. The worst case I think is not wearing shoes while not taking care of your nails. That is disgusting.

The second worst would be not attempting to brush your hair or teeth after getting out of bed.

The third would be not taking showers at a frequency high enough to overcome your personal natural tendencies to actually, physically, smell badly.

Agreed. Polos are Best Buy salespeople. If I'm dressing up to look professional, it's going to be in a suit.

Not having to, and choosing to wear a polo to work are different things.

Even if it's just on those all-day-meetings days where you interface with your PM and other biz types...

"Don't dress for the job you have, but rather the job you want".