sparkle, I understand where you are coming from on logo adorned clothes. When my DCs were little they never had any cartoon decorated, pictures, Thomas, Little Pony stuff on t shirts, fleeces etc. I hated it all and especially football shirts and made my son feel out of it by not allowing him to ever have one, which I now regret.
Without sounding as though I let them run off and play without supervision, if they are in ordinary coats, it is hard to keep an eye on them, spotting them is a mission!
You would hardly notice, the details on mine, it is discreet navy small embroidery. You wouldn't see it across a playground, but you might realise they are all in the same colour, which helps me keep track of them, allowing them freedom and to manage their own play without being cosseted and not allowed to take risks.
I certainly do not seem them as an advertising tool, I have far more business than I can ever possibly think about. At least 5/6 enquiries a week. Last week 12 alone, and 5 of those were people wanting to move children out of day nurseries.