One of the best shops in the Shibuya district is Onspotz, which is fully loaded with official fitted caps. The selection ranges from authentic MLB teams, independent brands, & Onspotz custom. The grid walls are covered from top to bottom with mostly black-based fitteds & color pop embroidery. NY fitteds dominate the majority of space with core teams such as LA, Philly, Boston, Chi-town, & ATL stocked in various colors. Definitely check for them in Shibuya, their new Harajuku base, or their site for the largest offering.