You can crochet with silver wire, but I suspect such a garment would be unwearable. There are metallic looking yarns such as Twilley's goldfingering, but they'd be very expensive on that scale. How about white with silver edgings?
silver dress
The silver dress that the Direct TV genie is wearing can be purchased. This dress is available for purchase online.
The important thing to remember about a masquerade ball is your mask! A beautiful costume is important (formal attire) but the mask is the thing. Research some fancy dress masks to understand the concept.
Normally for new born baby tutu-dress length is 15".
Silver
Here is how to dress like Demi Lovato (with related links) Brown Necklace Long Dangly Silver Earrings White Button Down Shirt Black Shirt (Related Link: http://www.kohls.com/kohlsStore/juniors/skirts/PRD~758682/Joe+Benbasset+Smocked+Crochet+Skirt.jsp) Black Tights Mid-Calf Leather Boots Thin Silver Belt To Go Around Shirt
Here is how to dress like Demi Lovato (with related links) Brown Necklace Long Dangly Silver Earrings White Button Down Shirt Black Shirt (Related Link: http://www.kohls.com/kohlsStore/juniors/skirts/PRD~758682/Joe+Benbasset+Smocked+Crochet+Skirt.jsp) Black Tights Mid-Calf Leather Boots Thin Silver Belt To Go Around Shirt
Silver Giorgio Armani dress of Cate Blanchett was created in 2007.
I would say either silver to match the beads, or maroon to match the dress. it's up to you.
Grey
silver
Here you go: 1) Slip Stitch 2) Single Crochet 3) Half Double Crochet 4) Double Crochet 5) Treble Crochet 6) Single crochet increase 7) Single Crochet decrease 8) Double Crochet increase 9) Double crochet decrease 10) Treble Crochet increase