Below are some photos that may help you decide which size to pick.

Pictured: oversized t-shirt, size XL
Model height: 6' 6"
Model size: high street XL


Pictured: fitted t-shirt, size M
Model height: 5'9"
Model size: high street 12
Model bust: 34DD


Pictured: oversized t-shirt, size S
Model height: 5'9"
Model size: high street 12
Model bust: 34DD


Pictured: sweatshirt, size M
Model height: 5'9"
Model size: high street 12
Model bust: 34DD