Okay so at my first wedding I was really nervous and my underarms were sweating so bad that all my pics show big stains on my dress, no stink, just wet...lovely

. I REALLY want to avoid that this time around! It only seems to happen when I'm nervous (even a happy nervousness), has nothing to do with being hot.
My dress has tiny cap sleeves so shields wont work. Does anyone have any other solutions to this problem?