From "When building business relationships, start with your shoes" by Marjo Johne at The Globe and Mail. 

"How should business owners dress when they’re meeting clients or potential investors?

There are basic rules I try to follow. I try to dress to match the tone or atmosphere of the place I’m going to. If it’s Friday and I’m going to a client that that has casual Friday, then I come in jeans. It’s a form of respect to the organization or client.

My one big rule is shoes; they have to look great. I’m not saying you have to buy the most expensive shoes, but people look at your shoes. Invest in a well-made pair and make sure they’re clean for your meeting."