An oversized button up shirt with slit on the sides and asymmetric hem that is longer on the back. The shirt has a high collar that is overlapping and has two buttons.
The sleeves are extra long to create a more interesting silhouette.
A medium weight cotton fabric is used so then if you wear the shirt unbuttoned it will be a light jacket.
Main photo model is 173cm, regularly wearing size S is wearing button up size
Second model is 182cm, regularly wearing size top M and pants size S/M is wearing shirt size M