Don't purchase clothing for the size you want to be. Buying clothes in a size smaller than what you wear in anticipation of losing weight will simply not fit properly --- which means they will not look good --- and you will only set yourself up for disappointment. Do not buy clothing in the hopes that you will change your overall shape. Buy for the size and shape you are now.
If you lose weight, you can always buy new clothes or have your old ones altered.
Instead, focus on being healthy and embrace your curves and the clothing that makes them look good.