Garment bags are designed to keep your dress crease-free and perfectly organized every time you travel. If you want your dress and suit to be ready-to-wear when you arrive to Paris, the very best way is to invest in a garment carrier. You can have a rolling garment bag or a shoulder garment bag.
And the best news: most garment bags are designed to be used as carry-on luggage when rolled or folded.
How to find it? Buy searching "travel garment destination bag" on Amazon or Ebay.
Pro tip: call the airline to find out how they handle passengers with large and delicate items like a wedding dress. Ask if they can hang the gown for you somewhere safe.