Just a thought OP, but Mumsnet is great for ideas but I wouldn't use it to feel confident about my wedding dress choice.
If you definitely want to look for another dress then this is a great place for help finding options. But it's not the place for increasing your confidence before the wedding. Someone will always be happy to tell you your choice looks shit in their eyes.
There was a lovely community of boho/alternative brides on Facebook (Rock and Roll Bride I think?) that will help you feel more confident in whatever choice you decide and help with practical stuff like underwear options, if you want a less bruising experience 😅