This reminds me very much of two guests at my wedding. Guest 1: royal blue satin "tits and twat" dress with pill box hat - everything on view and very much designed to draw attention. Guest 2: in her own (ball gown shaped) wedding dress, dyed a very, very, very pale mint colour. I really didn't mind but it would have been very upsetting for some people on their wedding day.
The problem with the orange dress is not that it is revealing (not "pearl-clutching" per se), but that it would - at any wedding I've been to - be incredibly eye-catching, and it's kind not to overshadow the bride. Also, I note the OP says she is 48, and feel that it might have a slightly "try-hard" vibe on someone of that age (and I'm not far off it so no shade intended), however banging the body. That's maybe not fair or right, but a possibility nonetheless.
I like the very orange colour, but - even if I had a body that would not look like an explosion in a firework factory had spread to the sausage factory next door, which I very much would - I'd still not wear them together. I like the idea of the skirt with a silk shirt (cream, and not shiny), and I would put that with appropriately coloured boots and maybe an oversized cardigan - but that would very much depend on the cardigan and I would have to see it on.
I edit this to say I am very much obsessed with oversize cardigans at present so may be well off there, but can see a way in my head to make it work - it's a texture thing, I think, and cocoon-y, maybe, rather than shapeless.