Here are some French publications with wonderful images: - http://patrimoine.editionsjalou.com/- it's a French magazine publisher which has very graciously put hundreds of archive issues of its magazines online, for FREE (take that, Vogue archive). There are thousands and thousands of wonderful images of women's clothing, particularly in the L'Officiel archives from 1921 to 2011, and L'Art et La Mode. This came from the tailor's forum.
Jonathan, you can click on the issue of choice, and then double-click until the page appears about 25% on the screen -- and then click Plein Ecran on the bottom right of the page, and it will download and fill up the screen. Then at the bottom of that screen, there should be the magnifying glass icon (+ and -) and you can make the pages as large as you like.