In Cameron's own handwriting and taken from one of the many notes she would write to herself, this fun green is a great message to share with the world!! Someone today may just need to see that. Unisex fit. To help you with sizes, Parrish is wearing an XL Shirt and Emily is wearing a Medium. Small is a good choice for a 10-12 year old child. Medium is comparable to a Women's 4-6. Most of the teen girls like the oversized Medium for a looser fit. Hope that "generalized" description helps you decide what's best for you.