Designed to be extremely versatile while always being breathable and mosture wicking due to 100% pure cotton muslin. Perfect for hot sweaty days. Wear under a suit or throw it on with shorts and flip-flops. You will find yourself wearing this shirt more than once a week! OEKO-TEX certified 100% pure cotton muslin. Pre-shrunk. Size Reference: Our dark brunette model, Amy, is 5'5", 117lbs (normally a size 0-2) and is wearing size Small in White and XL in Black. Laundry Tip: We do NOT recommend using fabric softener, dryer sheets, or chemical based detergents as they can cause the blanket to get hard and stiff from the chemicals. We pre-wash all our products in Bio Brite, our specially created, 100% natural, non-toxic, detergent/spot treater. Due to the all-natural cotton fibers, coloring may vary slightly from piece to piece. Because it is 100% cotton, some minor pilling may occur. Product colors may very depending on monitor and phone settings as well as calibration.