Bright pink sequin bow tie - sequins seem to be on the front only. It's pretty easy to find a matching satin for the backside. Black band - looks like a scrunchy band of satin to me, but I've seen a lot of Columbia's use a black elastic sequin band for this and it looks fabulous. The added benefit of a satin band is that it won't get hung up on your tail coat's collar..jpg)
I'm not certain the top photo is actually from the film - but I think it was taken during filming (probably a Mick Rock photo?) The band definitely looks satin here to me - but if it's not from the film it could have changed (as other things did).The second photo is a screen grab and does lend itself to the sequin band theory a bit more. This photo also shows the underside of her tail coat lapel is gold (not black).
Edited to add - I think the trading card photo (taken on set) also shows the band to look like a scrunched satin neck band.
