I’m assuming you want to do the classic Disney Sleeping Beauty in the pink/blue dress, since you didn’t specify.
The hardest parts of this pattern to find will be the bodice and that neckline. If you can’t find an all in one pattern (there seem to be plenty in kid’s sizes, but maybe you struck out on adult sizes), you wil need to cobble this together.
The skirt and underskirt are thankfully the easiest patterns of all: circle skirts. I’d say that Aurora’s skirt is a single full circle skirt, so 360 degrees of sweep. Luckily, this is the easiest type of circle to calculate for, and here is a calculator that can help you do it.
The pointy part seems to simply be an overlay on top of the skirt:
For the bodice, you want princess seams and a center front seam, but in order to get the distinctive V shape her bodice has, you have to make sure that the lines aren’t equidistant down the bodice, but rather, come inward into that V shape near the bottom. The bodice of this pattern looks pretty close, as does this bodice. Here are two out of print options:12.Of course, the bonus of that second one is that it has the neckline included!
For a great blog of how this dress goes together (including showing the shape of the neckline collar piece), I would recommend taking a look here.
Keep in mind that you will want to add some boning to this bodice to it can keep shape.
I hope that helps! Good luck :]