When I bought my dress I was told not only by the salesperson, but also the owner, that all the alterations I wanted would be possible. See bio for the list.
I get my dress on, and the seamstress starts talking to me about taking the dress in and getting rid of the bow. When I mentioned rounding the top, she says, "Oh, I'm not sure if I can do that."
I seriously almost cried. I took a deep breath and said, "When I purchased this dress, I asked about these alterations and I was assured by the salesperson and Elizabeth (owner) that my vision was possible."
She worked with it a bit more and figured it out. I am so glad I said something and wasn't nasty about it. It did make my heart start racing though!!! The alterations were even priced less than I expected, which is always nice!