During a wedding rehearsal, a bridesmaid is taken by pirates and becomes the prize of the battle of ego vs revenge between two of the most powerful pirate ships.

What is the protagonist of your story? the pirates? the woman? Why do pirates take the lady? She is special?

In the sequel does Johnny Depp crash the wedding?

Could you fit in when it's set? Is it now, or in the past? Could slip that information in before "most powerful" in your current logline (e.g - "two of the early 21st century's/Jacobian era's/whenever's most powerful...")

Who is the lead character?

Based on your premise (which sounds cool!)

When a kidnapped bridesmaid becomes the prize in a historic feud between two almighty pirate ships, [this particular protagonist] must [reach this particular goal] or risk her forever

(Insert your protagonist and his dramatic need)