Hah! She's so right. But I'd add wardrobe and makeup. It's really funny, but even the best episodes of, say, Poirot, or BBC Jane Austens, still have costumes and hair AND MAKEUP that's recognizable to the decade. It's not like the knowledge of this stuff doesn't exist, either. The field of research into medieval costume at least (which includes hair although makeup only to a lesser extent - since before the advent of realistic paintings there's a lot more guesswork) has an INCREDIBLY rich body of knowledge and even from the eary medieval period, there's a huge quantity of available depictions of women and their heads.

It's not ONLY Mary who would be shown without a veil - and for that matter she's often depicted with one too - but saints and queens, occasionally, but probably for the same reason (purity). And that's probably why the 19th-century-on historesque depictions of - I hesitate to confuse their subject with the actual period, so perhaps I should say the Age of Chivalry - typically feature the Eowyn on the Battlements hair. And of course, these latter-day depictions are the roots of the modern fantasy genre.