Hi Ellasmum,
sorry can't help with recommendations but thought I would just say we went to caulfield cup on saturday and I was amazed at the range of dresses being worn. it was basically anything goes. or I should say, any style seemed fine. there was no real standard but lots of floaty floral, patterned, plain, cream stuff both short and long. I wished I was 30 again so you should have notprobs finding something I did notice that there were heaps more fascinators or headpieces or headbands ie. anything to jazz up your hair but not really lots of hats. and black was definitely not in this year.