This is the costume known as "Flowerbomb". I've always loved this design from the very first time I played this game.
Every Shirobara cosplayer does theirs a little differently and this one follows that tradition. The entire base of the dress is white lightweight denim that was watercolored, dyed and painted. Next came ample amounts of beading, then the addition of hundreds of velvet and silk roses, many of which were also hand painted. Even the petticoat's bottom is roses, roses, roses!
Overall, this is one of my personal favorites because of the delicate colors and how it looks on me.
United States