I began to ponder this question when thinking about how I just don't even bother trying on dresses in vintage stores, because I know they never fit me. Whenever I visit an exhibit of historical garments, I never fail to marvel at how small they are. And Hollywood actresses are invariably bird-thin, regardless of the body shapes in vogue during the historical periods they portray.
She's just outlining the bare bones of her curiosity and beginning to plan the research. I look forward to her reports.