The sizing will depend on the specific dress you're referring to on our site. The size charts provided are from the designer or manufacturer of the item to be used as a guide. It will recommend a size to accommodate the largest measurement but ultimately the sizing is up to you! Sometimes a dress might need alterations for the perfect fit if possible. Please note, for example, if your bust is in a Large and your waist is only larger by. 5 inches, the option of a Large might fit. Feel free to contact us if you need any assistance!