Boys are curious and going through hormonal changes. They want to feel what its like to wear frillies, sexy panties, hose, and skirts, because only girls wear them and they don’t know what its like or how it feels. My feeling is that by trying to suppress this causes the desire to become stronger. Let him try what he wants and talk about it. It wil most likely diffuse the whole situation. It is pretty harmless in the grand scheme of things. It could be drugs, alchohol, or something else.