Derek Lam 10 Crosby, you can layer it with a shirt underneath like the first photo. This is an example.

Size 4, Small, oversized boxy fit
Marled, Heathered Grey
Striped pattern
Slit sides
Wide, Elbow length sleeves
High Quality
100% Cotton
Pull Over
Dropped Shoulders

Condition Pre-owned, EUC, like new

Measurements:
Pit to pit: 22" roughly
Length: 18"