Dress Anxiety

So... The dress I just ordered from Nordstrom for the summer wedding is not going to work out! My bf's mom finally spilled the beans and gave me some direction on what I should wear since I'll be at the family table.The request is simple long,flowy and colorful. But for my body type and my height dresses like that are hard to come by without altering them. This is going to be a lot more complicated then I thought. But I'm glad she gave me some insight on what to wear because I didn't have a clue! So the mission is on...long,flowy,colorful dress or bust!