A short-sleeved t-shirt with a rounded neck. 

T-shirt

A short-sleeved t-shirt with two buttons at the neck. 

T-shirt With Buttons

A person sitting with their head down in their hands, possibly napping.

A short-sleeved t-shirt with a pocket on the front. 

A speec bubble with three Z letters, indicating sleep.

A busy and overworked manager or employee surrounded by charts, graphs, and notifications.