Blouse is done!
I used a 100% cotton fabric which I bought from Economy Fabrics in June this year.
The buttons are shell buttons from the button drawers. Fortunately I managed to find a dozen all the same size.
The pattern is Prima March 2020 cut off to blouse length. I've also added a continuous placket for the opening rather than using the sleeve seam.
Now just need something for the bottom half!