hips: starvation, if you can still have a period, you haven't lost enough body fat, once you get under 12% - presto! Otherwise, get guys jeans with a definative box drop hip, which is slightly loose, not the skater or real low waist - think levi standard work jean with a longer drop and t-shirt over the waist band.
walk and move into people and you will be called sir all day long. Starvation sure helps though - try looking at the pics of olympics athletes, the track and field who are wearing two handkercheif and have no hips or breast of notice.
I don't know easy answers, but if you want what you want then you will reach what you need - the C - cups WILL turn into A's, of course, the trick then is to figure out how to hide the anorexia, and you spend all the time counting how many hours until you last had 38 calories and how you will only have 280 calories today - so, maybe not the best long term plan - take multivitamins unless you want your gums bleeding.