mature style guest apparels used for wedding party

Looking for a size 8 dress that is long and fitted. Must be short sleeve, sleeveless or strapless. Open to sparkles and sequins. Love Gallani style dresses. No A-line, empire line or mermaid silhouettes please. TIA mature style guest apparels used for wedding party :)
Edit: it can't be white because it's for my cousins wedding :)