Oh man, my sympathies. My maid of honor forced me (haha) to wear a sleeveless dress because she "didn't want to hear me b****ing all day about being hot!" So they had short sleeves, and we had an unseasonably cool day in June and you can see her shivering on the video! LOL
I can't think of any sort of specific look right off hand, but maybe you can figure out some sort of wrap/shawl/shrug that would work, even if you just wear it in between photos. But maybe in the sun, you'll be fine!!! Congrats and aloha