Refuse to consent to any searches of your person. Do not open your jacket to reveal what’s underneath. Don’t expose your pockets or anything inside of a purse either. Again, doing these things imply to the officer that you consent to be searched.
In Nevada, police officers can do what is called a pat-down search (frisk) to make sure you are not carrying any concealed weapons. The law allows for this for the safety of the police officers involved. The officer must have reasonable, articulable suspicion in order to justify a pat-down search.