As John J said above- "When in Rome do as the Romans do".

It is not the custom in Christian countries for women to cover their faces, as it may be in some Islamic countries. Western women while in an Islamic country are required to obey local customs, no matter what their own religion or customs might dictate.

At the same time look around at the number of Muslims, who "do not take alcohol", in the puds and clubs with their alcoholic drinks!

As an aside, a story told to me today by a Muslim girl (uncovered) was of being on a beach at Bournemouth on a hot day this Summer. Many girls were sunbathing topless, including two girls next to her. These two girls got dressed, put on their full black dress and headscarves and walked off the beach looking like a couple of penguins!
Colyn.