cute just isn't adequate: Philadelphia Wedding

This year I have two family weddings. One in Florida and the other in Pennsylvania. The philly wedding is that of my eldest cousin. She and her fiance were high school sweethearts who broke up and dated other people for about 3 years. They dated others but always thought of each other. This past year they ran into each other and realized that they missed one another. Well...the rest is history. This past November at my sister's wedding her fiance asked my aunt for my cousin's hand. Their wedding is this summer. Now comes the guest dressing challenge. Its in August. In Philadelphia. Yep. Humidity to the max. Summer in the city is definitely just like the song suggests. So this is my dilemma...cotton gauzy sundress...that seems too casual, or a festive party dress that will be appropriate but really hot (no pun intended). I don't know her colors or even her theme for the wedding. But I do know what I 'd do for a summer wedding. Moroccan Secret Garden. A beautiful mashup. The opulence of the gilded moroccan aesthetic and the elegance of the floral summer garden. Vibrant colors of pool blue, teal, peach, purple and some gold thrown in for good measure.

The three dresses below are some that I am considering purchasing for the event. The two satin dresses are gorgeous and very flattering. However they might be a little warm especially since the ceremony is outdoors. The cotton pattern dress is a little lighter and very festive. I still have months to decide and purchase a dress. But that's the fun part of window shopping right?