is this possible???

Have you already ordered it? Some manufacturers allow changes to their styles for an additional fee. Extending the gown may be one of them.

I've also seen other gown styles where the train is detachable. This could be an option as well. If you've already ordered, you could have a second train made up of the same fabric. The manufacturer may allow you to order extra material.

In either case, talk to your bridal shop.

ETA--typos fixed.