Hi Lei,
Love your great book list, and thanks so much for including Vintage Hats & Bonnets 1770-1970! Thought you might like to know that even though the 1st edition is out of print, the 2nd edition (2009) is available - with much more emphasis on the hats of the 30s-60s (which are much easier to find today). Also included are many styles from all eras that needed to be represented but that weren't available to me when the 1st edition was published.
Also, Flapper Fashionistas might like the two volume set on this exciting era: Roaring 20s Fashions: Jazz (covering thge 1st half of the decade) and Roaring 20s Fashion Deco (which covers the second). Together, at about 500 pages, they're a year by year picture of the era's fashion changes, including evening and day wear, sportswear - all professionally photographed and illustrated with period fashion plates and plenty of vintage photos. Each book also has a large section on men's and children's styles.
Many readers might also like the classic books of historian R. (Ruth) Turner Wilcox (which MMA also recommended), including my fav, The Mode in Hats & Headdresses; The Mode in Footwear and The Mode in Costume. All of her books go back just about to the dawn of time, and are chuck full of fascinating fashion facts in addition to her own illustrations. The Mode in Costume has been reprinted in paperback; the others I think will have to be hunted for.
Again, many thanks! Sue