Well, for menswear, it'd be a dress shirt or a button-up shirt; I think the equivalent womenswear term is a blouse, but maybe those terms still apply. It has a back yoke. The style in the front could be referred to as "vertical stylelines" or "curved princess seams". The collar looks like a convertible collar. The sleeves have cuffs and plackets.
I recommend just loading up pattern company websites (Butterick, McCall's, Simplicity, Vogue, and/or Burda) and just browse through the collections of women's shirts. If you don't need it too fitting, you can try the unisex collections as well.
FF9 cosplay? Hit me up!
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