I'm travelling to SA in Oct/Nov/DEc this yesr and would like to know what I will need by way of warm clothing ,shoes etc.I will be starting off Lima to Cusco then Cusco to Puno. Is it very cold at night will I need to bring a sleeping bag with me because for the rest of my trip arequipa, Tumbes, Quito, Panama city,Costa Rica I dont think I'll need one. I intend to bring a silk sleep bag only will this be enough?? Thanks for any replies