This was stated on the e-mail invite for the 14th birthday party of a girl DS1 knows. The dress code for the boys was "smart jackets - no jeans please".
DH picked DS and some girls up from this party at 11.30pm last Saturday. Things were in full swing - DS was on about staying later and getting an Uber home
DH was shocked to see all the girls tottering round in high stilettos. In the car on the way home, he was listening to the girls debating whether so-and-so's shoes were actually Jimmy Choos or fakes 
Has anyone ever encountered anything like this?