I have a chance to go to Buckingham Palace as a guest of someone and would like to do so. However, I will be 6 months pregnant by then. I have only worn jogging bottoms for the last 5 months and am thinking this won't be the right look. Where can I buy some smart, stylish, maternity clothes to look good on the day and give myself a boost after being ill for the last 3-4 weeks? Maybe a hat too.