Pronovias Dress Alteration Cost

I don't think the brand of dress is relevant so much as what you need done, your timeframe, and where you live. The only way to know if the quote is "reasonable" for your situation and location is to get a second opinion from another local tailor.

I agree with Maggie - it wouldn't be to do with the brand as much as it would be with the way the dress is constructed, the nature of the alterations and the amount of time there is to complete what needs to be done. Depending on the way the zip has been sewn in, that alone is likely to require the whole dress to be basically deconstructed, and when you say shorten the waistband, I'm not sure if you mean, take it in to make it smaller, or if you mean vertically. If vertically, the only way to do that would be to dis-attach the skirt and the bodice, resize the bodice and then sew them back together. This, together with the zip replacement is a fairly big job.

But the only way you will know if it's reasonable is if you get another quote.

Depends on the dress and the labor required to make those alterations.

If your dress has appliques, beading, etc. in the areas that need alterations, it may require a great deal of deconstruction - I've seen where a seamstress straight up had to take the beaded appliques off the dress in order to perform the alterations. That's a lot of work to be done well, and definitely commands its price.