How would you accessorise this?

[LadySybilLikesSloeGin]

www.johnlewis.com/store/closet-tie-front-dress-burgundy/p1793061?navAction=jump

I have an office party next week. It's in a pub, 70s theme and doesn't need to be smart. I have wine coloured shoes with gold embroidery and olive green beads and that's it. I have the day off tomorrow to pick up some bits but I'm rubbish at accessorising.

Please help

Thank you

What about a flower headband something like THIS
Claire's have loads.
Or a groovy WIG??
A handbag with some fringing?
Some 70s style glasses?
Is it fancy dress-ie or more classy?

Oh, the headband is pretty

Knowing my work, it will be very fancy dress-ie I don't think everyone's dressing up and the dress is the only one I've seen which will hide my mummy tummy.

Sparkles would be fab.