How to zhuzh this up a bit for a wedding?

[Dweebie]

Help! Have just bought this from Roman for a family wedding. I really like it but I need to make it a bit fancier than it looks in the pic. The colours are a bit odd - there’s a bit of mustardy yellow and the flowers are either grey or like a flat pale mint green. Don’t know whether shoes and bag should just be black or try to match one of the colours? Also what to do for jacket/ hat/ jewellery?

Strappy, barely there heels in black or nude, delicate gold jewelry. I would have a hat and do you really need a jacket?

A hat. This one.

Sorry, meant to say I wouldn't have a hat.

Thanks @Aquamarine1029 that’s really helpful

The dress is really pretty, looks floaty and very appropriate for a wedding. Good hair, sandals and a nice bag should be all that's needed imo.

Nude, gold or tan sandals or nude court shoes, personally no hat or bag as they get in the way (partners are great in lieu of a handbag, though without ones what's available)