Some costumes have these accessories already in the set and some don't, so you'll have to buy them separately.
Image by Digital_Rampage, CC BY 2.0, Flickr
Let's take a look what you'll need:
- golden headband or star crown
- golden cuff with red star
- golden rope
- red boots
- T-shirt with a cape
- T-shirt with golden foil
- temporary crown tatto.
I checked all these stuff at Amazon and all of them are available on their page. You can decide for just one or two additions or for all of them.
Star crown or headband is usually already part of the costume and you won't have to buy it separately. But if it isn't included or if you don't like it, you can easily replace it with a crown tatto.
Cuffs and golden rope usually don't come with a costume and you'll have to buy it separately as well as red boots. You can find few variations of red boots - for instance boots with white stripe or with golden decoration on the top. Boots have mostly high heels and few platform boots can be found too.
The last thing you can use (or not) is T-shirt. It can be used as a very comfortable costume - just a T-shirt with pants or short skirt.
And I almost forgot - if you don't have long dark hair, you may need a wig too. But it's not necesary - as you can see on the photo above there are few variations of Wonder Women costume - even the one with blond hair.
I believe that's about it for this costume - maybe you can add some beautiful and stylish make-up and enjoy at Halloween party.