What impression do you give off? What do the people you interact with think of how you look? This can be a dangerous question to actually ask. If it's bad they'll lie and if it's amazing they'll down play it. Instead take a long, REALISTIC, look in a full length mirror. Are your clothes faded, tattered, or torn? Are they ill fitting? Even if you feel "comfortable" you may not exude it. Remember: Good comfort is equal to, at least, the appearance of confidence. It is so incredibly important to make a positive powerful impression. You cannot do that if you don't have ALL your I's dotted, T's crossed, duck's in a row, etc, etc.
MORAL: Make good impressions. Do not rely on a great first impression only, impressions are continuous. Stay on top of things, by day, hour, and minute. Be comfortably confident continuously!