wedding wearing which backtrace to 1920

Hi.
I will be attending a wedding in Thailand in a month, I live in Brisbane. I am looking for a dress to wear to the wedding. The colour scheme is grey and pink, I am undecided which colour to wear. Silver is ok too. I am a size 8 in dresses but am short - 164cm (5'4") but larger in the bust so am after a dress that I can wear a bra with or a halter neck with good support. It will also need to be at least knee length preferably maxi dress. I am after something that is modest and elegant, that won't make me stand out too much or overshadow the bride or bridesmaids but still something really beautiful. I prefer the style where the torso is fitted and then flares out from the waist down. wedding wearing which backtrace to 1920