Objectivity is so easy when it comes to others.... but almost impossible when it comes to ourselves!
Which is why we torture our friends, loved ones, and anybody else within earshot, with the question, "Does this make me look _____ (fill in the blank)"?
When it comes to your business, how you project yourself can make or break you. Try not to think of yourself personally, but rather as the embodiment of your business. For example, if you were designing a new business card, what colors would best reflect your brand? Which font would you select? Would you use any graphic art? Approach your clothing choices with the same eye.
I know it's difficult, we all struggle with this! But give it a try. You might be surprised by your new found objectivity!