Ronnie Scott's - what to wear?

[Justinepants]

Evening all
Not for me but my mum. They're off to see Georgie Fame next month and she isn't sure how dressed up it is.
She's in her 70's but very fit. She tends to wear coloured jeans or tidy dresses.
I've said I'm sure you can get away with anything but suggested trousers and an eveningy top but if anyone actually knows it would be very helpful.

Been a couple of times and its mixed, everything from people in their jeans to sparkly evening dresses, all works really.

Thanks, Bellebelle. I thought that was probably the case.