White and light blue are universally flattering and work well in most situations
Seeing French Indochina, Indochinese Union, or Indochinese Federation could give you hints about a garment being made prior to 1947 or up until 1954 (in the case of the latter)
To maintain their longevity, remember the ultimate rules: Wash polos on gentle cycles with cold water, avoid excessive drying heat, and air-dry when possible
Opt for tops in neutral tones or bold prints to add visual interest to the ensemble without overwhelming the eye
You could MAYBE argue that they were looking at 16th-century different colored over- and under-gowns like this, but I think thats a stretch: The puffed sleeves, slashed to show another color underneath, are DEFINITELY a 16th-century reference: The short puffs are probably taken from similar styles to those shown above, with the fitted lower part of the sleeve removed
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