Not my experience, but the one of a friend.

She got married a couple months ago and at the wedding she told me a story (probably because I was the only very fat friend there) about getting her wedding dress. It looked beautiful on her but apparently when she went dress shopping, they had nothing in her size.

Instead of trying on dresses with her family, like she had planned, she had to look at pictures and try to imagine what they would look like on herself and then have it custom made to her measurements. Not only did this cost more than getting a pre-made dress and adjusting the measurements, it took away an experience that a lot of women who get married want to have.