I am going to Mamma Mia The Party on Sunday at O2 Arena in London. I have absolutely no idea what to wear! It's basically the show plus food and drink and an Abba Disco afterwards. Tickets were expensive! Has anyone else been and, if so, what did you/other people wear. I don't want to start getting fancy dress. I am a 55 old woman with an ok figure (size 10) but a bit of a tum. I was a teen in the 70s but have sadly binned all of my platform shoes and all other clothes which would have been perfect! Help, appreciate any responses.