Dress Alterations

My sister is a size 2/4. She bought a size 14/16 wedding dress. It was a floor sale and she fell in love, and that was that! It looked fantastic on the wedding day - it was a square neck fitted bodice with a large skirt, so it was easy to alter. Some dresses with a lot of detail, or complex lines can be far more difficult and potentially alter the integrity of the dress with too much taking-in.

How long has it been since you started these changes in your diet? I am no dietician or nutritional expert so I could be wrong, but even with continuing with the changes at some point you should plateau and eventual maintain a weight, you wouldn't necessarily continually lose the weight all the way up until your wedding. You could ask your doctor, or whoever you are working with on these changes, about if/when your weight might start to maintain. Typically in the beginning of dietary changes you notice more drastic results and then it kind of levels out. When you reach that point then you can go in for alterations. I have heard they can typically do alterations for about 2 sizes I believe, so that gives you some wiggle room as well.

Is your dress an A-line or ballgown? Those can be easier since the skirt is meant to be bigger, so it's just the bodice that would need the bulk of the work

I do agree that at some point your weight loss will start to taper off and plateau after a while. I'd ask your doctor that suggested the dietary change about what you can expect. Weight loss is also happens to every area of your body rather than being isolated to one spot, so that might not make alterations as dramatic as if you had lost it all in one place.