The dress may garner most of the attention, but no vision of white tulle is complete without a few painstakingly chosen accessories. And the more perfect they are, the better the odds they came from the Altered Bride. For more than a decade, Boston brides (and bridesmaids) have made this boutique a crucial stop on their way to the aisle. They come to quiz the knowledgeable and experienced staff and browse the exquisite offerings of jewelry, shoes, and veils, as well as the area’s largest collection of handmade tiaras. In her new and expanded Boylston Street space, owner Roseanna Martino acts as a guide, strategizing ensembles that are both simple and extravagant. And when even that is not unique enough, she’s happy to provide custom-designed headpieces and veils.