thanks for the replies. When i tried it on at home last night I wore these www.johnlewis.com/254942/Product.aspx and i think it looked okay - they were just peeping out a tad. I can't wear really high shoes as I have a dodgy back. If not those then strappy sandals. re the cold, we're sharing a limo to get to the ball and back home again and I have a black poncho type wrap that I can wear.
sorry, forgot to reply re hair. It's shoulder length so I'm rather limited as to what i can do with it although my local hairdresser is quite inventive so perhaps if i do go for this dress, I'll show it to her and ask if she can do something with my hair over to the opposite side to the shoulder strap maybe??