Chanda you're right that the verse does not explicitly say "cover your head", but it does say to draw your khimar over your chest to cover that. Khimar is a headcovering, its something used to cover your head. Someone who isnt versed in Arabic language and usage wouldnt understand that this verse does therefore contain in itself the order for covering the head, because why wear a headcover if its not covering your head. Its as if I said, "pull your socks up to your shins". And then someone comes along as says, she only wants you to cover your shins with your socks, she didnt say anything about covering your feet. Someone who knows what socks are, who understands what the term sock means and what its usage is, will know that obviously I intend for the feet to be covered as well. But someone who comes from a planet where there are no socks, she never heard the word sock before and never wore socks, she will say, no just cover your shin with the sock, you dont have to cover your feet with a sock because she didnt mention feet
^^ because it says use your khimar to cover your chest but doesn't specifically tell you to cover your hair, I certainly don't believe that covering your head is required by the quran.