I was outside, grilling in the rain last fall. The visiting daughter kept me company, wisely standing in a sheltering doorway. She loaned me her umbrella. I found out that I could tuck it down the neck of my jacket, getting shelter from the umbrella while keeping both hands free.
I dubbed it an umbellybrella: a grilling accessory ideal for those who trill in the rain, and don't care how they look.