Costume 1:I think her white skirt with the wave pattern would look nice in cotton, ideally a medium weight cotton so that it drapes well. Her waistcoat/corset needs to be made of a heavier material, might need boning too. Her blue underskirt could be cotton, though for an interesting texture you could try a material with a little shine to it (not very shiny satin, but maybe sateen). not sure about her top.
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