size 18 wedding guest dress help please

[AuntieMaggie]

I have a wedding in October and need to buy a dress and am looking for something lovely and feminine that I don't normally get chance to wear... can you help me find something?

I'm a size 18 with big boobs so high necks make me look huge and I hate my knees

Ooh some lovely suggestions thank you ( I've had some technical issues so sorry for the delay!)

I want to steer clear of dark block colour if possible certainly the day