Skill level: intermediate as the sewing instructions are basic and assume prior sewing knowledge. But you won’t know unless you have a go!
Blouse size UK s/m: bust 89cm-93cm/ 35″-36 1/2″
A simple magyar/kimono style blouse. Worn with or without shoulder pads depending on what decade you are aiming for.
NB: My sample blouse has 2 keyhole cut-outs, the pattern has 3. Change as you like.

15 page download including the 12 page pattern, a pattern assembly guide, measurements, cutting and basic sewing info.
See the pictorial on how to make simple shoulder pads -here-
A4 tiled pattern US letter tiled pattern
Check out this Threads Magazine article on basic pattern grading if you want to make a different size.
And some versions made up by other makers: