Britney Spears tee shirt

30/1 100% Authentic 100% Officially Licensed 100% Cotton Unisex. Perfect condition/Never worn 30/1 and 18/1 are referring to the garment thread and the number of stitches per inch. An 18/1 T-shirt is a normal standard T-shirt. A 30/1 garment is made from finer thread with more stitches per inch. This results in a softer and thinner garment with a more fitted cut than the 18/1.