What is the ruling on wearing modern headscarves or shawls, given the Hadith "one wrapping, not two"? And is the money obtained from selling them permissible or forbidden?

The fundamental principle concerning clothing is permissibility if it meets the Sharia-compliant criteria. Therefore, if these conditions are met in scarves or shawls, it is permissible to wear, sell, and buy them; otherwise, it is not. As for the hadith, "a single night, not two nights," it is weak.