Couldn't agree more
We had a group take over telecommunications, they wore suits, ties, white shirts and honest to god they had gold badges on their belts. NEVER got caught carrying a tool kit unless they had made their presence know to the customer, Then they would saunter back to their "office" and grab a toolkit. All to create a professional appearance. We, on the other hand, better qualified and trained, scurried around in the same uniforms the electricians wore. We garnered more respect from the customers than the Telecom guys because we carried our basic tools with us, got the job done usually on the spot, and we often got a little smudged up in the process.
Clothes show what kind of work you're willing to do to fix the problem, how soon you're willing to do it and if you are willing to "get down and dirty" with the problem.
Yes, clothes do speak of the man. They might speak a different language from what some think!