Stressed about the dress

Hey y'all! I'm currently planning my wedding for late September of this year and I'm in a bit of a dress dilemma. My fiance and I are trying to plan this wedding on a budget as we are also trying to buy a house this year. However, some things like photography, food and music are non-negotiables and we will spend the money where it's necessary, and thankfully after securing our vendors , we are still on budget. I tried on some dresses to figure out what kind of silhouette I like. When I tried on one dress from David's bridal I fell in love with how I looked and how I felt in that dress. I have a bit of body insecurities and that dress that I tried on made me forget about all those insecurities. I felt so great. However, that dress is $1,000 more than I had budgeted. I tried to order what looked to be the same dress from an online retailer and was pretty excited about it until I got it and tried it on. Although it says it's made out of a stretch satin, it doesn't seem like satin at all. It feels like polyester and I really wanted a satin dress. I understand that with my cheaper option there would be some differences, but now I'm second guessing if I want to settle with this dress that is not 100% what I wanted and it does not make me feel the way the dress in the salon made me feel. I'm now wondering if I should just spend the money on the dress that made me feel the best and talk to my fiance about how I will obviously save up and pay off this dress. I'm worried about broaching the topic with him because I'm worried that he is going to be upset about me wanting to spend so much money on a dress and not putting it towards the house, but as my matron of Honor mentioned, if you're spending so much money on a photographer, you should spend money on address you definitely want, because you don't want your photos to be very well done but you look back and think 'I wish I didn't get *that* dress'. She also said as a woman with body insecurities herself that getting the dress that you feel the most confident in is insanely important.
So what do I do? Am I assuming the worst in thinking that my fiance will not understand or will not be happy about me spending the money? I'm only going to wear the dress for like 8 hours. So do I really need to spend that much money into it? Should I go with the cheaper option and just figure out a way to be happy in that option? I'm seriously so surprised about how stressed I am about a damn dress.