This is a fairly long story, so I apologize. I believe this falls under etiquette, but if it doesn't, please let me know.
I went in today to get the bustle put in my dress, and my mom and I decided to get a corset back put in so I wouldn't have to worry about zipping it. We bought the dress in October, so I have gained a little bit of weight since then. The dress still looks good on me; it was just a little too tight for my taste, and I knew I wouldn't last the whole day with limited breathing ability. The "slip" (I call it a crinoline) I bought in October was also a little small, but I wasn't too concerned about it.
I went in the dressing room and got myself into the crinoline and dress (no one could come with me to the appointment), even though I couldn't zip either up all the way by myself. I went outside of the dressing room and waited for the seamstress. She came over and immediately started messing with the crinoline. She offered to exchange it for a bigger size since I still had the price tag on it, and I thought it was really nice of her, so I said sure. She told me she was going to double-check with her manager, but she'd be back in a second.
She went in the other room to her manager and got the okay, so I was happy about that. She came back out and started working on pinning the bustle for me so I could okay it, and the manager came out to talk to her. The seamstress, without even looking up from her pins, said, "Well, she's expecting, and I just don't think the slip will look good under the dress because I can't get it to stay down without wrinkling." I just kind of stood there, wondering if I'd just heard her correctly. She continued to repeat that I was expecting to every seamstress that came in the room to inquire about my dress (three or four in total, I believe), while I just stood there with this shocked look on my face.
I don't want to cause a fuss until after I pick up my dress, but I do feel like I can let them know I was upset by their assumptions. Am I allowed to do this after the fact? I realize I should have done it right then and there, but I was honestly so surprised by it that I couldn't think.
I'm just really curious about how I should handle this without coming across as either a bridezilla or just a chubby bride who takes everything personally. How do you think I should handle this while still being polite? Or should I even handle it at all, even on a customer service survey or whatever?