This is the cutest stripe oversized top.  It is by the brand Umgee. 

Stripe Collared Oversized Top

Key Features
• Split V-neck with button-front detail
• Short cuffed sleeves
• Straight hem
• Contrast trim
• Oversized
• Not Lined

Fit & Model Notes
• Model is 5'9" and is wearing a small.
• All Measurements are approximate.

Fabric Contents
• 83% Rayon
• 17% Nylon