criticizing the dress and price tag..

MashAllah..that's awesome.

To go slightly off-topic, I know many girls who got married when they were in college (and some even before!) so naturally they were not working or saving money, and thus they did not get to have as much choice in decor and dress and other certain things.

I don't think it's wrong to offer your honest opinion if someone is only contemplating something, for example, the nilofer dress someone is inquiring about.

However, after you obtain something, you shouldn't ask for opinions about it because you are setting yourself up for disappointment, it's different if you show it out of happiness and joy rather than for critique or opinions.