You could buy this J. Crew dress for $248 (! – it’s not even silk!)

Or you could score this cotton gauze from JoAnn on sale for $8/ yard…

…combine it with this McCalls 7925 pattern (you could shorten the skirt tiers by half and remove the skirt placket for an even closer match)….

…and boom–you’ve saved at least $200. (Yes, I bought this fabric.)