Before we talk about clothes, we have to talk about structure. 80% of fit issues are actually bra issues.
When you are busty, any dress that falls straight from the chest makes you look like a box. Your goal is defined waist + room for bust.
When you have a larger bust, the "tent" effect is the enemy. Wearing baggy clothes to hide your chest often results in hiding your entire figure, making you appear larger than you are.
For a busty figure, the neckline dictates everything: proportion, perceived bust size, and overall silhouette.