I work outside - frequently in the rain. I went to get a new rain jacket, and asked the guy at Dick's Sporting Goods to recommend me a good one.
Enter the Froggtogg. Its unbelievably light - so light I can wear it indoors with no problem. Its also not that expensive - $50. And its made of a paper like material that crinkles just like a diaper. Everyone will simply think its your jacket.
I'm sitting in a restaurant right now - wearing in public for the first time