You can buy small disposable ponchos or foil blankets to keep you dry in a storm. They come folded up about the size of a wallet and stow easily in the bottom of your pack. Remember many people die of hypothermia each year and this is often when the temperature is over 50 degrees. All you need is something to keep you dry and thus prevent the loose of body heat. When chiseling or hammering in hard rock you must protect your eyes and hands.
Safety glasses come in a variety of sizes and shapes and it is easy to find a comfortable fit.
Many quarries and clubs require safety glasses and sometimes hard boots. HAT - If you are working in bright sun a wide brim hat is the easiest way to protect your head and neck from sunburn and cut down on glare. Combine it with a cotton bandanna to keep the sweat out of your eyes and you are all set. I actually recommend stuffing a few extra bandannas into your pack or pockets since they are very versatile. I want to change before a long drive home.