I am a salesman and, modesty aside, I'm pretty good at my job. As such, I know that a big part of the job is presentation; not of the product, but of myself. If I act like I know what I'm talking about, people will assume that I do. Being the ethical and honest guy that I am, I of course make sure this is the case.
Conversely, if I behave as if I'm unsure or lacking in confidence, people will not take my words at face value even if I do know the subject authoritatively. The three factors you've listed all play a role and are an important aspect of the job. I do try to make myself as attractive as possible, I try to be aware of my own mannerisms in order to appear friendly and easygoing and I most definitely make sure that I am appropriately dressed. There's also more that goes into it, such as tone of voice, speech patterns, body language and even vocabularly, which should be tailored to match the individual - my manner of speech when speaking with someone who introduces himself as 'Dr. Doe' will be very different from the man in biballs who introduces himself as 'Jim Bob.'
As to your specific question, I suspect that it would affect their reactions to you, but that it would be a subtle change. The impact of your own actions and mannerisms will play a much greater role in how these people perceive you - if you don't walk the walk, they'll assume your wife is just exaggerating.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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