Not sure if this is the right place to ask about professionalism

Seriously though, this is the only place I know a large number of owners of established businesses are, and we're all customers too I guess.

Lead in to question...

So I'm starting a business with a mate and he's insisting that we get polo shirts done up with logos 'to look professional'.
I can't say I'm all that keen on polo shirts, I would think that a nice, good quality t-shirt with the biz logo on it would be just as professional.
So yeah, we're discussing it, but I need opinions on this.

If you're dealing with a business in a non-office environment, does it really make a difference to you whether the person you are dealing with is wearing a polo shirt, or a really nice quality t-shirt? (both with logos etc, only difference being the collar)

Does a collar really matter to your view, on a first impression, of how professional someone is?
Or does the way someone conducts them self negate the need for a collar?

I don't know what my beef is really, I just think collars are out dated, outmoded and seem pointless to me as a part of clothing.
Maybe I'm just rebelling against my hate of business shirts and ties, which I've worn for a good part of my career, but now I don't have to, yay!
Either way, I'd really appreciate some serious views on this.


Cheers
Matt