Ahhhhh i was having this discussion when getting my dress too!! I have a mermaid style as well, and the one I tried on was pretty tight, but I liked that the fabric wasn't bulging or loose in weird spots. The bridal consultant also suggested that when the dress comes in that I "let it out" a little bit so that I can sit. But you're absolutely right, i am only going to need to sit for our meal and that's it, so why not just keep the dress the way I like it??! The shape and back of my dress is very similar to this, and I love how it is so snug in the hips, and like you said, really shows off that mermaid shape. Although I have a love/hate relationship with Kim K, I'm sure she didn't give a damn whether she could sit or not lol So exciting that you had your fitting though and that you are still in love with you dress!! I would say get it fitted the way you want it so that you're feeling 100% Amazing on your wedding day!!