We've been invited to DH's best mate's wedding in Sydney, and have pretty much decided to go for it. The wedding's in a catholic church, then in a v posh hotel in central Sydney from 6pm. On the invite it says dress code "Cocktail".
For background, I/we don't "do" dressing up, we're (happy) housebound hermits since DS came along, and not mad socialisers before that! I have a dress from Monsoon which I hope will do, as I REALLY don't want to spend any more money than I have to on outfits. The pic's on my profile - it's silk, about 3/4 length, and the silk is patterned with small flowers on stems - damask is it called? I'm about 5'6", size 14/16, not much of a waist but passable in magic undies (!), with mid brown chin-length hair.
So, the question to you style mavens is : will the dress do? And if so, what can I get to go over the top - something shrug-like or a pashmina/wrap, bearing in mind it'll be about 35 degrees and my upper arms, while not horrific, are 40 years old, like my good self... Also, what shoes can I wear with it? I'd ideally like to wear a pair of court shoes, like these : similar shoes in black, because I already own them 
but even I feel that might be a little funereal... They need to be comfy enough to trek across Sydney, and mid-heel at the most.
Help!