What did you do?
Mine happened a few years ago with a newish friend. He'd just split with his girlfriend and was upset that he had no date for a party he was going to-his Mum and stepfather's anniversary. He asked if I'd come and I said of course-love me a good party.
This friend was a bit of a scruff truth be told. Obviously it didn't bother me as I liked him a lot and I am not concerned about things like that but it is relevant because my mind must've thought 'friend and party=casual'. He lived in jeans and T shirts, his work clothes were a bit too large for him but he didn't care, his house was a bit of a tip, he liked his rocky music and rougher pubs-all in good fun, we got on well.
It was summer and I found myself in a strange town with him before the party where he was last minute buying them a present. I don't know what it was, but something brought a cold wave of reality over me when I realised that this wasn't going to be a casual event at all. I think from something friend said.
We went into a shop where he was choosing a photo frame and I made an excuse about needing some last minute make-up supplies and ran outside. I had about 10 minutes and the only shops I could see were a charity shop and a small, independent shoe shop. I ran into the charity shop and hurriedly rushed around like a madwoman but VERY luckily found myself a lovely black silky midi-dress.
Stuffed it in handbag.
Ran across to shoe shop. Very luckily for me spotted a pair of strappy heels in the sale and snapped them up.
Ran outside to friend looking around for me, apologised and told friend that I'd just realised that the heels I'd brought with me might be a bit too painful to wear all night so I decided to pop into a shop and buy some others.
He bought it.
It was a fab night.
Now I am writing this I am thinking the more wise of MNters are all going to say that I should have said 'Sorry friend, I am just realising that this might be a bit more of a formal affair than I thought, would you mind if I just go off and look at clothes for half an hour?'
But yes, that's not me. --Plus I think if the shoe was on the other foot, I'd have made sure my friend knew what sort of party it was!