Go a bit bigger when purchasing your gown. It's a lot simpler to take a dress in up to 2-6 sizes (without compromising the look or design) than to try and let it out. Why? It’s because most manufacturers do not leave enough excess material to let the dress out.

Also, it's important to note, wedding dresses are often sized a bit smaller than you expect! (Ex: If you are a street size 6 then you will need to go a couple sizes up depending on the largest part of the body) This means if your top is bigger than your hips you would go by the top sizing or if your hips are larger than your top then you should go by your hip sizing when purchasing a wedding dress.