Mu-mu's work for me....I always make sure it's XXL and it serves to shield me from the sun too as I slink down and use it as a pup-tent to protect myself from the rays! If scotch-guarded, maybe it could even serve to protect you from VERY light sprinkles?? (may need to cut some eye holes)
But Claudia....I think we could start a fashion trend that sweeps Europe!