Confidence is a kind of trick – it’s a short-circuiting of the self-conscious loop we often find ourselves in.  For example, we can get caught in a loop about what to wear today, or what others think of us in terms of what we are wearing.  And once you’re in that loop, it’s hard to stop.  My advice is to wear comfortable clothing as this makes you less conscious of your clothes.  For example, if you are pregnant, go for maternity clothing and don’t try to compete in the fashion stakes with your non-pregnant friends.  Confidence is all about comfort.