@NamingNoNames Nobody, because this isn't school.
I've looked at all the other suggestions and really like the look of a few of them, despite the being quite far out of my normal very basic comfort zone. But you don't know until you try. I think I might order the Anaya dress from John Lewis @Londonmummy66 suggested, and the Love & Roses one on Next is gorgeous @Lilylolamillie . I have to admit I'd normally scroll by something with that much pattern, but I'm feeling quite good about myself for the first time in a while so perhaps it's time I move away from the clothes that I know I'll just blend in.
I'll also take a look at the dress hire options, which hadn't even crossed my mind.
Loving all the suggestions and appreciate the constructive feedback. 😀
Edit to add, in answer to the poster who asked why I might never wear it again, honestly I just don't go many places where I'd have a reason to wear a pretty dress and really I just feel a bit stupid dressing up for some reason, but if I can find something that doesn't feel too OTT then I'll try and find more reasons to wear it. DH is never one to turn down the offer a date night.