We started to do a little research on this sparkling little fabric accessory and discovered some very interesting things. First, the name "sequin" originates from the Venetian colloquial noun zecchino (Venetian pronunciation: [tsek'kino]), meaning a Venetian Ducat coin, rendered into French as "sequin" (French pronunciation: [sɛqɛ̃]) **Thanks Wikipedia** You most commonly see them on costumes and usually around the holidays.
If you are one who wants to add more to your bridal party than the regular gown, maybe adding this to your dresses my be just the drama you are looking for. One caveat to this though is, these dresses will cost your girls quite a bit of money unless you can find a seamstress who can make them for you or if you can find them on sale via an online retailer. Keep this in mind when thinking about how you want them to look. Also consider the time it might take to receive the gowns once they are order so make sure you allow enough time before your wedding so you don't risk trying to scrape something together at the last minute. Let us know if you have considered going this route for your bridal party.