OK, I'm rubbish with clothes and need advice. I'm going to a hen day in a couple of weeks' time. Should be a very civilised affair: lunch in a very nice (but also kinda laid back) restaurant in London, followed by late afternoon/early evening cocktails in what looks like a very cool cocktail bar in the City. Not sure, but I don't think it will go on into the evening. I haven't been anywhere at all like this for years (ie pre-children!), and I just don't have a clue what to wear. Does it call for a summer dress (if the weather's nice), or something more evening-y? Help!