two sizes Click to see full answer. Also question is, can you alter a wedding dress to make it smaller?Yes, easily. A lot of the times bridal dress sizing differs from street sizes so it’s possible the dress may fit you perfectly. Most brides buy a wedding dress at least 1-2 sizes bigger than usual dress size.Likewise, how much can I alter my wedding dress? Remember to Budget for Alterations while others do a flat fee (around $500 to $700) that covers anything you’ll need to make the dress fit you perfectly. Design changes can cost anywhere from $50 (to cut a sweetheart neckline) to a few hundred (to add lace or beading, reshape the silhouette, or change the fabric). Simply so, can you alter a wedding dress that is too big? The general rule is that you can’t expect a tailor or seamstress to let out or take in a wedding dress more than a couple of sizes. A dress too big will require a ton of work and you can never be guaranteed that the final item will hang nicely on you. The tailor will need to take the garment apart and then re-cut it.How many sizes can you alter a bridesmaid dress?Tailors can do different things depending on their experience, but the rule of thumb is to stick to no more than 3 dress sizes larger. All dresses are designed differently, but the size difference will be more noticeable in certain styles, like a strapless dress with princess seams.