It's 6-8 sizes too big, but buy it in your size anyway!?

I have been to two bridal stores to look at dresses. I'm a size 0 or 2, but the smallest dress size the places carried was a 6 and a 10. I feel like I have no idea what these dresses would look like in my size since the front would be smaller (in the bust/neckline) and all I could see on the back were the clips they had on it. When I finally found one that I thought I could like, they expected me to just buy it in my size and hope for the best. I find this ridiculous! So, I ordered one online from JJ House, but I'm super worried I won't like it in person. And, the return policies for all of the online stores are absolutely insane. Send help and luck. 😭😬