Louise - that is a super stylish look you put together! The dress is incredible on its own, then adding the bumbag changes the vibe - makes it edgier without getting fancier (does that make any sense?)
I am not totally sold on bumbags but mostly because I remember wearing fanny packs the first time around - I even had one in neon colors (uggh!) and they all adjustable had nylon webbing belts. Thankfully yours is a modern studded interpretation and they can't be beat for convenience - no shoulder or neck problems with them!