Step 7: Find bridesmaid dresses.
Sung Boutique did the bridesmaid dresses for the Phantom of the Opera wedding, and posted the exact styles they give the bride as choices in the show.
You can buy the exact styles, however each one will cost you at least $200 each... XP
So I'll list each dress with it's price and then list some more affordable alternatives I found.
Dress 1: Black Lace Prom Dress on sale for $192:

-Roberta Jacquard Gown from the BonTon, $98:
-Black Evening Gown from Formal Gallery, found by Sears, $149:

Dress 2: Black Gold Lace Sequin Evening Dress on sale for $248:

-Black Prom Evening Gown from Formal Gallery, found by Sears, $139:

Dress 3: Wine Strapless Tafetta Evening Gown for $196:

-Satin Bandage Gown with Crystal Pin from Amazon, $79.99:

-Strapless Ball Gown from Amazon, $93:

Once you ordered the dresses, accessorize your maids with pearl necklaces and earrings, and you're all set! Don't worry about getting real pearls, your maids *shouldn't* mind and it will help everyone save money!
Cost for bridesmaid dresses and accessories = varies
I put varies because the cost of bridesmaid attire for the bride will be a personal choice. You may pay for their dresses, or may chip in a set amount for each maid. You may give them their accessories as gifts, or just one special component. You may have other ideas for bridesmaid gifts. So this is really entirely up to you.
Now that your bridesmaids are all pretty, it's your turn! We go on to Step 8: The bride's dress!!!