Great choice of dress and shrug; as they are both rather simple you can go a bit mad with accessories (btw there was no link to the necklace).
I think purple, brocade and gold is very elegant, so would stick with these colours for accessories, too.
Lots on Notonthehighstreet, have discounted all the eelskin bags (as they freak me out) but if you are fine with eelskin (and happy to pay £200+), then by all means have another look.
Otherwise some more ideas: hope something catches your eye. Off to work, will check back later.
purple clutch but would prefer a touch of gold detailing or a crystal to link to shoes
this comes in purple and cream, check both
[[http://www.notonthehighstreet.com/carameldesigns/product/ruffelle-adele-clutch-bag quite adorable and a bit of contrast to the dress/shrug, love this! ]
this comes in two sizes, the larger one has a detachable strap
wow, if you can stretch to £250, simple lines should ean it won't date so quickly
still looking for something in brocade fabric...
this is a great price given the bag is chevre or lambskin lambskin is a delicate leather but the feel of it is fabulous, I would check that the zipper detail is gold
can't go wrong with this simple styling, gold detailing, great price, low stock though