I recommend looking at the young movie stars of those times, like Shirley Temple or Judy Garland. What they wore in and out of the movies, followed, or even set trends.
Also, Vogue had some doll patterns out that are, so far as I can pretty historically accurate for those time periods. I believe they're vintage patterns, even.
Vogue1
Vogue 2Vogue 3 (and my favorite for what it's worth.)
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