The picture of your is really beautiful than in model. Usually the gowns and body shapes decides the beauty of dresses. For tall girls, the fairy tale dresses are bad and better for curvy brides.
Ok it is not a big problem, few of my clients have faced such problem and my designer suggested them to put net or embroided cloth over that and few buttons to make them not look bold.
I think it will be too soon for invitation as your wedding is on next year. For wedding invitations use electronic wedding card which are cheaper and good and highly preferred these days as it saves time and money. Social media can play a best role in this.
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Generally wedding planner arranges all dresses which looks perfect with the wedding atmosphere.
Sorry i don't have any idea about the sites for a good bridesmaid gown.
congratulations on finding the perfect dress, my clients takes a lot of time to select the dress which matches the theme and also look good for photography.