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You can look good all day, but if your speech isn't good, or the audience can't hear you, they won't be impressed. You should have the appropriate rate, not too fast nor too slow. You should have an appropriate volume, where the whole audience can hear you. Finally, you should annunciate all of your words correctly.

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Like I said before, if someone is dressed in a suit and tie, you shouldn't be dressed in pajamas.

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You need to look respectful, that is not only done by what you wear, but how you wear it. You should stand and sit without slouching

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Clothing needs to be appropriate. If the audience is dressed formally, you should be dressed formally. For example, probably don't wear pajamas.