This link is to a picture of Louise Brooks (a film star in the 1920's according to Miss Dita Von Teese) wearing an outfit I think the curvier women could pull off.
http://www.theothersideofkim.com/ima...brooks0046.jpg
I would say have a look in River Island, they are stocking some really lovely 1920's stuff at the moment (stuff i would kill for)
Apart form that, Dita says 1920's = ivory skin with rouge, smudged black eyeliner and smokey dark colour on lid, pencilled small rosebud shaped lips, crimson nails, glossy pixie bob or tight marcel waves (long hair needs to be pinned up).
Hope that helps, My dita book has never failed me =]